Revert "Use powerline bar in tmux"

This reverts commit bb029ba182cb53f7dca22e5fbe9db5bfcf9ccfc7.

Powerline slows down netbook
Submodule update

  - UltiSnips
  - fugitive
  - molokai
  - syntastic
  - tagbar
  - vim-ruby
  - xkbswitch
Added vim-git submodule

Included are syntax, indent, and filetype plugin files for git,
              gitcommit, gitconfig, gitrebase, and gitsendemail.