update to react-source 0.12 final

(cherry picked from commit 2ebce56)

Conflicts:
	react-rails.gemspec

Author: grahamcracker

react-rails.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'execjs'
   s.add_dependency 'rails', '>= 3.1'
-  s.add_dependency 'react-source', '0.11.1'
+  s.add_dependency 'react-source', '0.12'
 
   s.files = Dir[
     'lib/**/*',