Merge branch 'upgrade-coffee-rails' into 'master'

Upgrade coffee-rails to 4.1.1

Includes Rails 5 support.

[See Changelog for more info](https://github.com/rails/coffee-rails/blob/master/CHANGELOG.md#411-dece
mber-18-2015).

Working towards #14286.

See merge request !3398

Gemfile.lock

@@ -126,9 +126,9 @@ GEM
     coderay (1.1.0)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
-    coffee-rails (4.1.0)
+    coffee-rails (4.1.1)
       coffee-script (>= 2.2.0)
-      railties (>= 4.0.0, < 5.0)
+      railties (>= 4.0.0, < 5.1.x)
     coffee-script (2.4.1)
       coffee-script-source
       execjs