resolve/refinerycms — pull request #1445 by simi (2012-03-12 22:25:51+00:00)
Title: Use therubyracer in Gemfile when needed

Unclean implemetation of my idea.

#1406 #1412

For JRuby, ```therubyrhino``` is already used by rails.
For other Rubies, there is commented ```therubyracer```. If you have another runtime installed in path (like node.js on Linux), you don't need another. If there is no ```ExecJS``` compatible JS runtime, ```therubyracer``` is used.