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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.

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

Define empty functions instead of none at all if we can't figure out the
platform.

correcting an issue about encoding some people was having
added a message when the user doesn't have curl
added varibles for colors->easier to customize

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.

add command to ignore changes to file temporarily