Fix for Rails 4.1/Minitest 5.1

Closes #4. Ref cucumber/cucumber-rails/issues/275 and atlrug/atlrug4#41

Squashed commit of the following:

commit f3f792820b8923d74f941acb892559e595583255
Author: Matt Wynne <matt@mattwynne.net>
Date:   Wed Jan 1 19:40:39 2014 +0000

    Ignore .bundle files (whatever they are)

commit 9ff4c85bab83ebc0b712bf23696174f0104473a7
Author: Matt Wynne <matt@mattwynne.net>
Date:   Tue Dec 31 09:45:41 2013 +0000

    Attempt to fix build on Ruby 2.1

commit 895b23e6ca087e1e71516e0b66ec86339f43788f
Author: Andy Lindeman <andy@andylindeman.com>
Date:   Mon Dec 30 12:00:19 2013 -0500

    Propagates exit codes from other runners

commit a7317908673d6707e22e26025763df0a96771601
Author: Andy Lindeman <andy@andylindeman.com>
Date:   Mon Dec 30 10:53:30 2013 -0500

    Adds test coverage around Minitest 5.{1,2}.0 and ActiveSupport 4.1.0.beta1

commit ae0b75a488ae2cf66adb6d8368dc7a0cbc9587cc
Author: Andy Lindeman <andy@andylindeman.com>
Date:   Mon Dec 30 10:33:57 2013 -0500

    Adds 2.1.0 to the build matrix

commit 804433826a0255ca9563da5e860f1f33c3a39d77
Author: Andy Lindeman <andy@andylindeman.com>
Date:   Sun Dec 29 23:01:39 2013 -0500

    Adds fix for Rails 4.1/Minitest 5.1
Relese v0.0.3