vim: switch to NeoBundle + much more.

* Add unite.vim and make statusline display its statusline output.
* Add shortcut for 'q:' and make statusline display its statusline
  in a special colour.
* Add auto indetation support (not sure for how long, though).
* Add leader key, to clean up Ctrl-keyspace.
* Remove colours for statusline in TTY (not completly tested yet).