add some useful git aliases

thanks to http://blog.apiaxle.com/post/handy-git-tips-to-stop-you-getting-fired/
update subs
remove submodules
add colors from zedshaw's vimrc
remove submodules (gitmodules)
add back powerline
Better git links &c
Python: change tw to PEP8-compatible 79
Remove IPython and some others
Update subs - AGAIN!
Updates to gitconfig
Cython alias
Use python mode instead of custom scripts
Add hat tip to Harry Marr for the great auto-workon script
minor tweaks
Remove some unused/old files
better git completions and aliases
add emmet and update subs
make pythonrc compatible with IPython 1.0
skip rst for pasta