gitconfig: Allow machine-local overrides.
hgrc: Allow machine-local overrides.
vimrc: Switch tw to 72 and sw/sts to 4.
Ignore .pyc.
Upgrade oh-my-zsh.
Update vim bundles: git submodule update --remote
vimrc: Remove very old abbreviations.
vimrc: Disable folding.
vimrc: Remove annoying mouse mode.