vim: Adding UltiSnips

Signed-off-by: Martin Svangren <martin@masv.net>
[vim] Moving snippets dir

Ultisnips doesn't allow a dir called `snippets/`.

Signed-off-by: Martin Svangren <martin@masv.net>
[zsh] Heroku toolbelt stuff

Signed-off-by: Martin Svangren <martin@masv.net>