Depend on capistrano-bundler, which is required for any Rails setup
as suggested by @Kriechi https://github.com/capistrano/rails/pull/15#issuecomment-27129808
Merge pull request #22 from kirs/depend-capistrano-bundler

Depend on capistrano-bundler, which is required for any Rails setup
Minor
Why do we advise users to execute cap install?