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The $OSTYPE variable is set at ZSH compile time and can be safely used
to determine the OS of the system. e.g. darwin (os x)

fixes #2076

related to #1587
closes #2200
closes #2561

closes #1817

closes #1825

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outdated gems in gemset.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/