Ignore Session.vim by default
Add aliases for tmuxinator
Move `vs` into own file
Improve upon vim's `do` and `dp` mappings

* Run diffupdate after diff{put,get}
* Use mappings in visual mode (I use `x` instead of `d` in visual mode, anyway)
Fix mapping to edit vimrc files and rename to `re`
Change CtrlP mappings to include CtrlPMixed