Remove useless `assets.compress` option, Rails 4 uses only `assets.js_compressor`

> The config.assets.compress option should be changed to config.assets.js_compressor like so for instance

config/environments/production.rb

@@ -11,8 +11,9 @@ Gitlab::Application.configure do
   # Disable Rails's static asset server (Apache or nginx will already do this)
   config.serve_static_assets = false
-  # Compress JavaScripts and CSS
-  config.assets.compress = true
+  # Compress JavaScripts and CSS.
+  config.assets.js_compressor = :uglifier
+  # config.assets.css_compressor = :sass
   # Don't fallback to assets pipeline if a precompiled asset is missed
   config.assets.compile = true
@@ -74,7 +75,6 @@ Gitlab::Application.configure do
   config.action_mailer.raise_delivery_errors = true
   config.eager_load = true
-  config.assets.js_compressor = :uglifier
   config.allow_concurrency = false
 end