don't set MethodCallback#eql? and MethodCallback#hash protected - rubinius uses these methods internally for [MethodCallback.new, MetodCallback.new].uniq!
Set required ruby version
Pointing to a specific tag of Rails

When pointing to `master` we can lose the reference if the file is changed.

Let's point to `v4.1.2` instead.
Merge pull request #15 from Benny1992/master

MethodCallback#hash and MethodCallback#eql? - Rubinius Bug
Merge pull request #16 from joneslee85/patch-1

Set required ruby version
Merge pull request #17 from arthurgeek/patch-1

Pointing to a specific tag of Rails
Syntax highlighting for Gemfile instruction

[ci skip]
Merge pull request #18 from parndt/patch-1

Syntax highlighting for Gemfile instruction
Experimental support of JRuby in 2.0 mode
Updated Travis CI configuration
[ci skip] Add JRuby to README
Merge pull request #19 from lotus/jruby-support

Experimental support of JRuby in 2.0 mode