Added "private" bundle

Here you can add vim overrides that you need to exclude from Github.

Of course, this *will not work* for other sharing mechanisms like Dropbox.
Added shell `clear` before `add --patch` and `diff --cached`

Thanks to [this question on SO][1].

  [1]: http://stackoverflow.com/questions/7534184/git-alias-multiple-commands-and-parameters
Split long line in gitconfig for readability