diff --git a/package.json b/package.json
index 7ca3912..32d264f 100644
--- a/package.json
+++ b/package.json
@@ -56,6 +56,7 @@
     "husky": "^0.13.4",
     "jest": "^20.0.4",
     "lint-staged": "^3.6.0",
+    "mobx": "^3.2.0",
     "prettier-standard": "^5.0.0",
     "rimraf": "^2.6.1"
   },
diff --git a/yarn.lock b/yarn.lock
index 986ee10..28ba2b0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -212,20 +212,20 @@ babel-code-frame@^6.16.0, babel-code-frame@^6.22.0:
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
-babel-core@^6.0.0, babel-core@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.24.1.tgz#8c428564dce1e1f41fb337ec34f4c3b022b5ad83"
+babel-core@^6.0.0, babel-core@^6.24.1, babel-core@^6.25.0:
+  version "6.25.0"
+  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.25.0.tgz#7dd42b0463c742e9d5296deb3ec67a9322dad729"
   dependencies:
     babel-code-frame "^6.22.0"
-    babel-generator "^6.24.1"
+    babel-generator "^6.25.0"
     babel-helpers "^6.24.1"
     babel-messages "^6.23.0"
     babel-register "^6.24.1"
     babel-runtime "^6.22.0"
-    babel-template "^6.24.1"
-    babel-traverse "^6.24.1"
-    babel-types "^6.24.1"
-    babylon "^6.11.0"
+    babel-template "^6.25.0"
+    babel-traverse "^6.25.0"
+    babel-types "^6.25.0"
+    babylon "^6.17.2"
     convert-source-map "^1.1.0"
     debug "^2.1.1"
     json5 "^0.5.0"
@@ -245,13 +245,13 @@ babel-core@^6.0.0, babel-core@^6.24.1:
     babel-types "^6.23.0"
     babylon "^6.17.0"
 
-babel-generator@^6.18.0, babel-generator@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.24.1.tgz#e715f486c58ded25649d888944d52aa07c5d9497"
+babel-generator@^6.18.0, babel-generator@^6.25.0:
+  version "6.25.0"
+  resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.25.0.tgz#33a1af70d5f2890aeb465a4a7793c1df6a9ea9fc"
   dependencies:
     babel-messages "^6.23.0"
     babel-runtime "^6.22.0"
-    babel-types "^6.24.1"
+    babel-types "^6.25.0"
     detect-indent "^4.0.0"
     jsesc "^1.3.0"
     lodash "^4.2.0"
@@ -808,40 +808,40 @@ babel-runtime@^6.18.0, babel-runtime@^6.2.0, babel-runtime@^6.22.0, babel-runtim
     core-js "^2.4.0"
     regenerator-runtime "^0.10.0"
 
-babel-template@^6.16.0, babel-template@^6.24.1, babel-template@^6.3.0:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.24.1.tgz#04ae514f1f93b3a2537f2a0f60a5a45fb8308333"
+babel-template@^6.16.0, babel-template@^6.24.1, babel-template@^6.25.0, babel-template@^6.3.0:
+  version "6.25.0"
+  resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.25.0.tgz#665241166b7c2aa4c619d71e192969552b10c071"
   dependencies:
     babel-runtime "^6.22.0"
-    babel-traverse "^6.24.1"
-    babel-types "^6.24.1"
-    babylon "^6.11.0"
+    babel-traverse "^6.25.0"
+    babel-types "^6.25.0"
+    babylon "^6.17.2"
     lodash "^4.2.0"
 
-babel-traverse@^6.18.0, babel-traverse@^6.23.1, babel-traverse@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.24.1.tgz#ab36673fd356f9a0948659e7b338d5feadb31695"
+babel-traverse@^6.18.0, babel-traverse@^6.23.1, babel-traverse@^6.24.1, babel-traverse@^6.25.0:
+  version "6.25.0"
+  resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.25.0.tgz#2257497e2fcd19b89edc13c4c91381f9512496f1"
   dependencies:
     babel-code-frame "^6.22.0"
     babel-messages "^6.23.0"
     babel-runtime "^6.22.0"
-    babel-types "^6.24.1"
-    babylon "^6.15.0"
+    babel-types "^6.25.0"
+    babylon "^6.17.2"
     debug "^2.2.0"
     globals "^9.0.0"
     invariant "^2.2.0"
     lodash "^4.2.0"
 
-babel-types@^6.18.0, babel-types@^6.19.0, babel-types@^6.23.0, babel-types@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.24.1.tgz#a136879dc15b3606bda0d90c1fc74304c2ff0975"
+babel-types@^6.18.0, babel-types@^6.19.0, babel-types@^6.23.0, babel-types@^6.24.1, babel-types@^6.25.0:
+  version "6.25.0"
+  resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.25.0.tgz#70afb248d5660e5d18f811d91c8303b54134a18e"
   dependencies:
     babel-runtime "^6.22.0"
     esutils "^2.0.2"
     lodash "^4.2.0"
     to-fast-properties "^1.0.1"
 
-babylon@^6.11.0, babylon@^6.13.0, babylon@^6.15.0, babylon@^6.17.0:
+babylon@^6.13.0, babylon@^6.17.0, babylon@^6.17.2:
   version "6.17.2"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.17.2.tgz#201d25ef5f892c41bae49488b08db0dd476e9f5c"
 
@@ -941,6 +941,10 @@ camelcase@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-3.0.0.tgz#32fc4b9fcdaf845fcdf7e73bb97cac2261f0ab0a"
 
+camelcase@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
+
 caseless@~0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
@@ -962,7 +966,7 @@ chalk@^1.0.0, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
-chokidar@^1.6.1:
+chokidar@^1.6.1, chokidar@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-1.7.0.tgz#798e689778151c8076b4b360e5edd28cda2bb468"
   dependencies:
@@ -1107,6 +1111,13 @@ cosmiconfig@^1.1.0:
     pinkie-promise "^2.0.0"
     require-from-string "^1.1.0"
 
+cross-spawn@^4.0.0:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-4.0.2.tgz#7b9247621c23adfdd3856004a823cbe397424d41"
+  dependencies:
+    lru-cache "^4.0.1"
+    which "^1.2.9"
+
 cross-spawn@^5.0.1:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
@@ -1487,6 +1498,18 @@ exec-sh@^0.2.0:
   dependencies:
     merge "^1.1.3"
 
+execa@^0.5.0:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/execa/-/execa-0.5.1.tgz#de3fb85cb8d6e91c85bcbceb164581785cb57b36"
+  dependencies:
+    cross-spawn "^4.0.0"
+    get-stream "^2.2.0"
+    is-stream "^1.1.0"
+    npm-run-path "^2.0.0"
+    p-finally "^1.0.0"
+    signal-exit "^3.0.0"
+    strip-eof "^1.0.0"
+
 execa@^0.6.0:
   version "0.6.3"
   resolved "https://registry.yarnpkg.com/execa/-/execa-0.6.3.tgz#57b69a594f081759c69e5370f0d17b9cb11658fe"
@@ -1610,6 +1633,16 @@ flow-bin@^0.47.0:
   version "0.47.0"
   resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.47.0.tgz#a2a08ab3e0d1f1cb57d17e27b30b118b62fda367"
 
+flow-copy-source@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/flow-copy-source/-/flow-copy-source-1.2.0.tgz#0ce7267cca593e347da69fcf75f82a768291e730"
+  dependencies:
+    chokidar "^1.7.0"
+    fs-extra "^3.0.1"
+    glob "^7.0.0"
+    kefir "^3.2.0"
+    yargs "^8.0.2"
+
 for-in@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
@@ -1632,6 +1665,14 @@ form-data@~2.1.1:
     combined-stream "^1.0.5"
     mime-types "^2.1.12"
 
+fs-extra@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-3.0.1.tgz#3794f378c58b342ea7dbbb23095109c4b3b62291"
+  dependencies:
+    graceful-fs "^4.1.2"
+    jsonfile "^3.0.0"
+    universalify "^0.1.0"
+
 fs-readdir-recursive@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs-readdir-recursive/-/fs-readdir-recursive-1.0.0.tgz#8cd1745c8b4f8a29c8caec392476921ba195f560"
@@ -1703,6 +1744,13 @@ get-stdin@^5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/get-stdin/-/get-stdin-5.0.1.tgz#122e161591e21ff4c52530305693f20e6393a398"
 
+get-stream@^2.2.0:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-2.3.1.tgz#5f38f93f346009666ee0150a054167f91bdd95de"
+  dependencies:
+    object-assign "^4.0.1"
+    pinkie-promise "^2.0.0"
+
 get-stream@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-3.0.0.tgz#8e943d1358dc37555054ecbe2edb05aa174ede14"
@@ -1763,7 +1811,7 @@ globby@^5.0.0:
     pify "^2.0.0"
     pinkie-promise "^2.0.0"
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.4:
+graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.4, graceful-fs@^4.1.6:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
@@ -2426,6 +2474,12 @@ json5@^0.5.0:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/json5/-/json5-0.5.1.tgz#1eade7acc012034ad84e2396767ead9fa5495821"
 
+jsonfile@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-3.0.1.tgz#a5ecc6f65f53f662c4415c7675a0331d0992ec66"
+  optionalDependencies:
+    graceful-fs "^4.1.6"
+
 jsonify@~0.0.0:
   version "0.0.0"
   resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.0.tgz#2c74b6ee41d93ca51b7b5aaee8f503631d252a73"
@@ -2443,6 +2497,12 @@ jsprim@^1.2.2:
     json-schema "0.2.3"
     verror "1.3.6"
 
+kefir@^3.2.0:
+  version "3.7.2"
+  resolved "https://registry.yarnpkg.com/kefir/-/kefir-3.7.2.tgz#fb713ecc0b24d741964e0b3e308026fae5c0806d"
+  dependencies:
+    symbol-observable "1.0.4"
+
 kind-of@^3.0.2:
   version "3.2.2"
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-3.2.2.tgz#31ea21a734bab9bbb0f32466d893aea51e4a3c64"
@@ -2641,6 +2701,12 @@ map-obj@^1.0.0, map-obj@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/map-obj/-/map-obj-1.0.1.tgz#d933ceb9205d82bdcf4886f6742bdc2b4dea146d"
 
+mem@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/mem/-/mem-1.1.0.tgz#5edd52b485ca1d900fe64895505399a0dfa45f76"
+  dependencies:
+    mimic-fn "^1.0.0"
+
 meow@3.7.0:
   version "3.7.0"
   resolved "https://registry.yarnpkg.com/meow/-/meow-3.7.0.tgz#72cb668b425228290abbfa856892587308a801fb"
@@ -2702,6 +2768,10 @@ mime-types@^2.1.12, mime-types@~2.1.7:
   dependencies:
     mime-db "~1.27.0"
 
+mimic-fn@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.1.0.tgz#e667783d92e89dbd342818b5230b9d62a672ad18"
+
 minimatch@^3.0.0, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
@@ -2722,9 +2792,9 @@ minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2.0:
   dependencies:
     minimist "0.0.8"
 
-mobx@^3.1.11:
-  version "3.1.11"
-  resolved "https://registry.yarnpkg.com/mobx/-/mobx-3.1.11.tgz#400b1e3c00a4249dfe36e9bca28ef36f057d4a28"
+mobx@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/mobx/-/mobx-3.2.0.tgz#5efb3280bc7f6eb9299a252c9ff9b4403cbd8c5a"
 
 ms@0.7.1:
   version "0.7.1"
@@ -2904,6 +2974,14 @@ os-locale@^1.4.0:
   dependencies:
     lcid "^1.0.0"
 
+os-locale@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/os-locale/-/os-locale-2.0.0.tgz#15918ded510522b81ee7ae5a309d54f639fc39a4"
+  dependencies:
+    execa "^0.5.0"
+    lcid "^1.0.0"
+    mem "^1.1.0"
+
 os-tmpdir@^1.0.0, os-tmpdir@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
@@ -3572,7 +3650,7 @@ supports-color@^3.1.2:
   dependencies:
     has-flag "^1.0.0"
 
-symbol-observable@^1.0.1:
+symbol-observable@1.0.4, symbol-observable@^1.0.1:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/symbol-observable/-/symbol-observable-1.0.4.tgz#29bf615d4aa7121bdd898b22d4b3f9bc4e2aa03d"
 
@@ -3703,6 +3781,10 @@ uid-number@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/uid-number/-/uid-number-0.0.6.tgz#0ea10e8035e8eb5b8e4449f06da1c730663baa81"
 
+universalify@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.1.0.tgz#9eb1c4651debcc670cc94f1a75762332bb967778"
+
 user-home@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/user-home/-/user-home-1.1.1.tgz#2b5be23a32b63a7c9deb8d0f28d485724a3df190"
@@ -3775,6 +3857,10 @@ which-module@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/which-module/-/which-module-1.0.0.tgz#bba63ca861948994ff307736089e3b96026c2a4f"
 
+which-module@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
+
 which@^1.2.10, which@^1.2.12, which@^1.2.9:
   version "1.2.14"
   resolved "https://registry.yarnpkg.com/which/-/which-1.2.14.tgz#9a87c4378f03e827cecaf1acdf56c736c01c14e5"
@@ -3849,6 +3935,12 @@ yargs-parser@^5.0.0:
   dependencies:
     camelcase "^3.0.0"
 
+yargs-parser@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-7.0.0.tgz#8d0ac42f16ea55debd332caf4c4038b3e3f5dfd9"
+  dependencies:
+    camelcase "^4.1.0"
+
 yargs@^7.0.2:
   version "7.1.0"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-7.1.0.tgz#6ba318eb16961727f5d284f8ea003e8d6154d0c8"
@@ -3867,6 +3959,24 @@ yargs@^7.0.2:
     y18n "^3.2.1"
     yargs-parser "^5.0.0"
 
+yargs@^8.0.2:
+  version "8.0.2"
+  resolved "https://registry.yarnpkg.com/yargs/-/yargs-8.0.2.tgz#6299a9055b1cefc969ff7e79c1d918dceb22c360"
+  dependencies:
+    camelcase "^4.1.0"
+    cliui "^3.2.0"
+    decamelize "^1.1.1"
+    get-caller-file "^1.0.1"
+    os-locale "^2.0.0"
+    read-pkg-up "^2.0.0"
+    require-directory "^2.1.1"
+    require-main-filename "^1.0.1"
+    set-blocking "^2.0.0"
+    string-width "^2.0.0"
+    which-module "^2.0.0"
+    y18n "^3.2.1"
+    yargs-parser "^7.0.0"
+
 yargs@~3.10.0:
   version "3.10.0"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-3.10.0.tgz#f7ee7bd857dd7c1d2d38c0e74efbd681d1431fd1"