Multiple changes; Details below.

- Fix Omnicomplete menu so 'Shift+Tab' performs <C-p> (move up / previous)
- Don't exit multiple-cursors right away
- Add mappings for CtrlP buffer finding
- Add hidden setting for buffers
- Add many surrounds for most used functions
- Add more fugitive mappings for most used commands
- General organization
Replace vim-exchange with vim-unimpaired

This new plugin provides many key bindings, some include exchanging
lines