Revert "Update .vimrc solarized color options to look correct in Mavericks"

This reverts commit e741e2d6506fd5f4da138d19694f893e2b5301cb. The reason I had
to change these options was becausing I did had the terminal in iTerm2's
preferences set to 'xterm' rather than 'xterm-256color'.
Update git-completion.bash

This commit updates the git-completion.bash to
git/git/@44484662d83de2ae98d04738ec43d4dea1f859a8.
Add git-prompt.sh

__git_ps1 used to be part of the git-completion script, but was
split out. This commit adds it back as the new-and-improved git-prompt script,
from git/git@44484662d83de2ae98d04738ec43d4dea1f859a8.
Cleanup prompt and bash_profile