Many updates

* Add git aliases - `a` and `s` for `add -A` and `status -sb` respectively
* Add default rspec config file
* Add new shortcuts for vim+tmux - rake, zeus rake, and bundle - to send appropriate commands to other pane
* vim add plugins
  'scrooloose/syntastic'
  'kien/ctrlp.vim'
  'dockyard/vim-easydir'
* configure ag and ctrl-p
* update path
* add `gap` alias to kill all lingering binding.pry's