Thoughts on invoking pip module instead of command line?

[bstriner]

Interested in your thoughts on invoking pip from within python. People might have different aliases for pip but using the pip package seems to work more broadly. Not having to use a temp file is a bonus.

Tested on Windows python 2.7 and 3.5 and Ubuntu 16.04 python 2.7. Please let me know if this works in your development environment.