Add docstring to fabfile.py
Remove unused imports from fabfile.py
Prefix private functions in fabfile.py with _

This prevents them from showing up in fab -l.
Add docstrings to all the functions in fabfile.py
Give more helpful error message in gitrepos if fab vagrant prepare hasn't been run
Rename test_git to test_sympy
Update TODOs in fabfile.py
Add print_ option to md5, so it doesn't print when used internally
Use hide() to hide commands with long output that aren't important
Check for files in the tarball that are in git and shouldn't be there
Better error message in an unlikely situation
Whitespace
Update the release README