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Based on: http://comments.gmane.org/gmane.comp.encryption.pass/235

Using the chpwd hook function causes some junk to be printed to STDOUT after
returning from a subshell wherein the working directory was changed. In rare
cases, this can cause issues with 3rd party tools. An example is this issue
with the Python virtualenvwrapper tool:

https://bitbucket.org/dhellmann/virtualenvwrapper/issue/216/lsvirtualenv-and-workon-output-broken-in

Signed-off-by: Gaetan Semet <gaetan@xeberon.net>

Setting the locale to C will stabilize sed, so it won't stop processing
the mvn output when it encounters invalid characters (like binary data)

This makes it also more viable to add the `alias mvn='mvn-color`, as
the coloring is less obtrusive, and there won't be any issues with sed
breaking because of an invalid character inside the stream

Also add a test function that allows messing with the cache-creating
regex with some assurance that you're not trampling other people's
index-parsing.

Switch to using curl and regular expressions to generate a local cache
file so that we don't need to hit pypi.python.org every time.
This (obviously) results in a massive speed improvement, especially if
you spawn new shells frequently.

This also makes the autocompletion work for me, it didn't before. (pip
would always time out.)

And, also, for fun: This allows you to explicitly set which pip indexes
to use. Technically the old version of the plugin should have had this
behavior automatically -- without having to do more than configure pip
-- but the install completion never worked for me so this is a net gain
in functionality.

The ForkLift plugin now supports ForkLift 2 as well as ForkLift 1.
If ForkLift is not running it also waits for it to be running before
trying to switch to the specified directory

Autocompletion fails if there's only one mark, since the ls command
will not display the parent directory with the trailing colon.
Handling the single mark case separately and validating the symlink
explicitly, resolves the issue.

the folder structure changed '.cocoapods/' -> '.cocoapods/repos'

Change marks function and remove 'function' keyword as suggested by pielgrzym in https://github.com/robbyrussell/oh-my-zsh/pull/2045#issuecomment-22820224

Add _completemarks function as suggested by pielgrzym in https://github.com/robbyrussell/oh-my-zsh/pull/2045#issuecomment-22826540