remove all trailing spaces
modify airline status bar to make is more succinct, add current line number to the left of current line
make tmuxinator autocompletion work, from http://vikas-reddy.blogspot.com/2013/01/zsh-autocompletion-for-tmuxinator.html
Merge pull request #1 from Chun-Yang/master

vimrc: Modify airline status bar. Add current line number to the left of current line.