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Use the same scheme as Darwin - sysctl instead of nproc, which doesn't exist in FreeBSD

Closes #2545
Co-authored-by: Daniel Bye <dbye@users.noreply.github.com>

Calling awk is not necessary here, sysctl has the -n flag to print the value.
Signed-off-by: Clemens Gruber <clemensgru@gmail.com>

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.

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/