rails/spring — pull request #268 by jalkoby (2014-03-04 19:47:29+00:00)
Title: Move spring gem into bundler `tools` group

It's just a change a documentation, but I don't know why everyone puts gems like `spring`, `capistrano`, `zeus` into a development group. They don't need to required by bundler in a default development env. So I like to use a `tools` group which tells that gem is important, but not require it in any is environment.