Fix for brew installing powerline on Mac OS X 10.9

#python

#osx

#homebrew

#pip

#powerline

Follow the fix below if you get an error message like the following:

error: can't combine user with prefix, exec_prefix/home, or install_(plat)base

Fix: Then the simply omit the --user option and your install will complete just fine.
See the information and links below for the source of the fix.

Note: the latest docs are incorrect as of 2014-03-04.

The correct instructions can be found in the changes on Github: Update OSX installation instructions - b988b1b - davidcelis/powerline - homebrew powerline installation instructions.

See GitHub Issue #552 for more info