Issue #52 - Move secret_key_base to env var

Pull the actual value out of the code and reference it from a
environment variable instead.
Use a new value since the public one was insecure.
Put the new value into an env var.
Add the encrypted env var to the travis file.

.travis.yml

@@ -1,6 +1,9 @@
 language: ruby
 rvm:
-  - 2.0.0
+- 2.0.0
 before_script:
-  - psql -c 'create database tinder_test;' -U postgres
-  - rake db:migrate
+- psql -c 'create database tinder_test;' -U postgres
+- rake db:migrate
+env:
+  matrix:
+    secure: XCqK+WRk7e3sFdR0g3ogCzSYY+Z4Xlmn2TZwAdHjUWbD1Zdfx6c1RmrbqgA9vvQhe31QxPE4zO0eqXVFhV7UpjxeZnt07tHIINh9bstbzKoSzy1dcDqSZTCqlGoNPemYcjpPl9S34ZHYrSP3qXRB4LLCPK8Kt9EtfEPahKg1JPs=

config/initializers/secret_token.rb

@@ -4,5 +4,4 @@
 # If you change this key, all old signed cookies will become invalid!
 # Make sure the secret is at least 30 characters and all random,
 # no regular words or you'll be exposed to dictionary attacks.
-Tinder::Application.config.secret_token = 'fe31f85b3ebe2a20f1408b9056dc566d53b7ba4db0f5e1957e2da85728c90b591762299bfbf6ee1ad4e1d404f6f5c02ea7fbee895a47f2d12c3151b65bd14829'
-Tinder::Application.config.secret_key_base = 'fe31f85b3ebe2a20f1408b9056dc566d53b7ba4db0f5e1957e2da85728c90b591762299bfbf6ee1ad4e1d404f6f5c02ea7fbee895a47f2d12c3151b65bd14829'
+Tinder::Application.config.secret_key_base = ENV['SECRET_KEY_BASE']