Inve won't probably ever be merged in virtualenv, in that case including it in our script might be
the simplest choice, first stab at getting rid of 'inve' as a separate script
Add version command
Refactoring
Refactor the chdir context manager into absolute paths

Not really important, but the code should be a decent example and use better practices

https://mail.python.org/pipermail/python-ideas/2013-January/018777.html
Rewrote tests from shunit into python w/ py.test
Merge branch 'builtin-inve'

Conflicts:
	pew/pew.py
Commit old stashed changes (a docstring and a new test), flake8 fixes
Merge branch 'version_cmd'