refactor: spaces around ='s
map: select entire buffer with vy
plug: add vimux & turbux for tmux-based testing

read more at http://velvetpulse.com/2012/11/19/improve-your-ruby-workflow-by-integrating-vim-tmux-pry/
and http://thepugautomatic.com/2012/07/tests-on-demand-using-vimux-and-turbux-with-spork-and-guard/