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closes #2779

This makes adding, deleting and merging a lot easier.

Since the `bower` plugin specifies a `bi` alias and `bundle` plugin
specifies a `bi` function, there is a name clash when using both
plugins, which results in the message "Can't 'bundle install' outside a
bundled project" when trying to execute `bower`.

This adresses #2486

The mailcatcher gem does not work correctly when executed through Bundler.

Recommended by @sj26 per https://github.com/sj26/mailcatcher#bundler.

Only check the bundler version when we call bi. This fixes two issues:
First, if there is no bundler available system-wide this will cause an
error each time zsh loads. Second, if new bundler is installed
system-wide but you change into an rbenv with an older version, the
alias will no longer work.

Added taps to bundled_commands

Added strainer & tailor to commands in bundler plugin.

Added berks, foodcritic, kitchen, and knife commands to bundler plugin.

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outdated gems in gemset.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