Changes the tutorial to get etc from git and build it

doc/simplecluster/Procfile

@@ -1,3 +1,3 @@
-etcd: etcd --data-dir /tmp/etcd.data$PORT
+etcd: ../../../../../../bin/etcd  --data-dir /tmp/etcd.data$PORT
 doorman: $GOPATH/bin/doorman -logtostderr -config=./config.yml -port=$PORT -debug_port=$(expr $PORT + 50) -etcd_endpoints=http://localhost:2379 -master_election_lock=/doorman.master -hostname=localhost
 

doc/simplecluster/README.md

@@ -7,16 +7,10 @@ In this tutorial we'll start a simple cluster consisting of 3 doorman servers. T
 
 [etcd](https://github.com/coreos/etcd) is a [distributed lock manager](https://en.wikipedia.org/wiki/Distributed_lock_manager) that Doorman uses for leader election.
 
-On OS X, you can use [Homebrew](http://brew.sh/)
+Retrieve and build etcd:
 
 ```sh
-brew install etcd
-```
-
-On Ubuntu, you can do
-
-```sh
-sudo apt-get install etcd
+go get github.com/coreos/etcd
 ```
 
 ### Foreman
@@ -440,4 +434,4 @@ resource: "fair"
 capacity: 100
 ```
 
-And now, both `big` and `bigger` received 300 capacity units.
+And now, both `big` and `bigger` received 300 capacity units.