Add version_sorter gem

Gemfile

@@ -114,6 +114,7 @@ gem 'settingslogic'
 # Misc
 gem "foreman"
+gem 'version_sorter'
 # Cache
 gem "redis-rails"

Gemfile.lock

@@ -537,6 +537,7 @@ GEM
       raindrops (~> 0.7)
     unicorn-worker-killer (0.4.2)
       unicorn (~> 4)
+    version_sorter (1.1.0)
     virtus (1.0.1)
       axiom-types (~> 0.0.5)
       coercible (~> 1.0)
@@ -662,4 +663,5 @@ DEPENDENCIES
   underscore-rails (~> 1.4.4)
   unicorn (~> 4.6.3)
   unicorn-worker-killer
+  version_sorter
   webmock