Remove duplicate and outdated dependencies #3
See http://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/ This allows outdated gems not to get in the way of a successful bundle install.
Jeweler combines dependencies specified in the Rakefile with those from the Gemfile. This was causing the problem that #2 attempted to fix. Additionally, remove the old dependency on thoughtbot-shoulda, a gem which has since been renamed to shoulda, which is already in the Gemfile as a development dependency.
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