Merge pull request #4631 from CocoaPods/seg-gemfile-jruby

[Gemfile] Allow installing on jruby

Gemfile

@@ -47,5 +47,5 @@ group :debugging do
   gem 'rb-fsevent'
   gem 'kicker'
   gem 'awesome_print'
-  gem 'ruby-prof'
+  gem 'ruby-prof', :platforms => [:ruby]
 end