Add Support for Installing Python and pip packages

[moonglum]

I just installed the new powerline (which is created by the author of vim-powerline and is rewritten in Python. It can be used in Vim, tmux, the shell and iPython currently – using it in tmux only). This process included installing python, linking it and installing a pip package, in this case:

brew install python
brew link --overwrite python
pip install --user git+git://github.com/Lokaltog/powerline

I will add a new class that will be able to do just that :smile:

[bitboxer]

I can't use the new powerline till this is fixed :ghost:

[moonglum]

There you are :wink: To install it, set up Python with

Python.new(["git+git://github.com/Lokaltog/powerline"])

(or read it from your yaml :smile:)

(test-driving exogenesis with vim-dispatch works really awesome by the way)

[bitboxer]

I just installed it. Hooray!

[moonglum]

Awesome :dancer: