Rspec2 gemspec fix

After specifying branch to use in my Gemfile like:

    gem 'rr', :git => 'git://github.com/btakita/rr.git', :branch => 'rspec2'

I got the following after running bundle install:

    rr at /Users/damselem/.rvm/gems/ruby-1.9.3-p0@cra/bundler/gems/rr-91f638cee364 did not have a valid gemspec.
    This prevents bundler from installing bins or native extensions, but that may not affect its functionality.
    The validation message from Rubygems was: ["scratch.rb"] are not files