don't precompile scss assets

Gemfile

@@ -74,7 +74,6 @@ gem 'google-protobuf', '3.10.0.rc.1'
 gem 'sprockets', '~> 3.7', '>= 3.7.2'
 gem 'sprockets-rails', '~> 3.2', '>= 3.2.1', :require => 'sprockets/railtie'
 gem 'coffee-rails', '~> 4.1', '>= 4.1.1'
-gem 'sassc-rails', '~> 2.1', '>= 2.1.2'
 gem 'uglifier', '~> 2.7', '>= 2.7.2'
 gem 'mini_magick', '~> 4.5', '>= 4.5.1'
 gem 'remotipart', '~> 1.2'
@@ -88,18 +87,19 @@ group :development do
   gem 'hologram', '~> 1.4'
   gem 'web-console', '~> 3.7'
   gem 'httplog', '~> 1.3'
+  gem "listen", "~> 3.0.5"
+  gem "spring"
+  gem "spring-watcher-listen", "~> 2.0.0"
 end
 
 group :development, :test do
   gem 'rspec-rails', '~> 3.8', '>= 3.8.2'
   gem 'byebug'
-  gem 'spring'
   gem 'teaspoon-jasmine', '~> 2.2.0'
   gem 'brakeman', '~> 4.6', '>= 4.6.1', :require => false
   gem 'rubocop', '~> 0.77.0'
   gem 'rubocop-performance', '~> 1.5', '>= 1.5.1'
   gem 'rubocop-rails', '~> 2.4'
-  gem 'listen', '~> 3.1', '>= 3.1.5'
 end
 
 group :test do

Gemfile.lock

@@ -361,9 +361,9 @@ GEM
     launchy (2.4.3)
       addressable (~> 2.3)
     link_header (0.0.8)
-    listen (3.2.1)
-      rb-fsevent (~> 0.10, >= 0.10.3)
-      rb-inotify (~> 0.9, >= 0.9.10)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
     lograge (0.11.2)
       actionpack (>= 4)
       activesupport (>= 4)
@@ -578,14 +578,6 @@ GEM
     ruby-progressbar (1.10.1)
     ruby_dig (0.0.2)
     safe_yaml (1.0.5)
-    sassc (2.2.1)
-      ffi (~> 1.9)
-    sassc-rails (2.1.2)
-      railties (>= 4.0.0)
-      sassc (>= 2.0)
-      sprockets (> 3.0)
-      sprockets-rails
-      tilt
     sentry-raven (2.13.0)
       faraday (>= 0.7.6, < 1.0)
     shoryuken (4.0.3)
@@ -605,6 +597,9 @@ GEM
     sort_alphabetical (1.1.0)
       unicode_utils (>= 1.2.2)
     spring (2.1.0)
+    spring-watcher-listen (2.0.1)
+      listen (>= 2.7, < 4.0)
+      spring (>= 1.2, < 3.0)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -713,7 +708,7 @@ DEPENDENCIES
   jwt (~> 2.2, >= 2.2.1)
   kaminari (~> 1.0, >= 1.0.1)
   launchy (~> 2.4.2)
-  listen (~> 3.1, >= 3.1.5)
+  listen (~> 3.0.5)
   lograge (~> 0.11.2)
   logstash-event (~> 1.2, >= 1.2.02)
   logstash-logger (~> 0.26.1)
@@ -748,13 +743,13 @@ DEPENDENCIES
   rubocop (~> 0.77.0)
   rubocop-performance (~> 1.5, >= 1.5.1)
   rubocop-rails (~> 2.4)
-  sassc-rails (~> 2.1, >= 2.1.2)
   sentry-raven (~> 2.9)
   shoryuken (~> 4.0)
   shoulda-matchers (~> 2.7.0)
   simple_form (~> 4.1.0)
   simplecov (~> 0.1)
   spring
+  spring-watcher-listen (~> 2.0.0)
   sprockets (~> 3.7, >= 3.7.2)
   sprockets-rails (~> 3.2, >= 3.2.1)
   teaspoon-jasmine (~> 2.2.0)