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Clean command is undocumented (not included in
bundle help output), however that is very useful,
especially in RVM environment you can clean up
outdated gems in gemset.

http://blog.wyeworks.com/2011/12/27/bundle-exec-rails-executes-bundler-setup-3-times
http://yehudakatz.com/2011/05/30/gem-versioning-and-bundler-doing-it-right/

The heroku command should not be executed via bundler, see:
https://github.com/heroku/heroku/issues/173 

this fix allows _within-bundled-project() to properly pickup a Gemfile
within a root level folder (ie. /my_project)

Removed the assignments to fpath as well, since that's all handled in the .oh-my-zsh/oh-my-zsh.sh boot script.

Removed calls to compinit in the extract and the bundler plugins. compinit should only be called once, after all modules, libs, etc are imported.

As per http://blog.wyeworks.com/2011/12/27/bundle-exec-rails-executes-bundler-setup-3-times