Fixing parallel_tests hangs with bundler 1.3

In bundler 1.3, parallel_tests hang when running rspec because rspec is not
required by rspec-rails in 2.x. Instead bundler tries to offer suggestions
which hangs waiting for user input. This fixes #185
Fixing tests for bundler 1.3 fix
Merge pull request #187 from daviddavis/master

Fixing parallel-tests for bundler 1.3 and rspec 2