Replace YADR's whitespace-killer with just a map

I already have a FixWhitespace function from the vim-trailing-whitespace plugin.
Fix comment in split-natrural.vim
Add vim-tmux-navigator plugin

For seamless navigation between Vim and Tmux splits!
http://robots.thoughtbot.com/seamlessly-navigate-vim-and-tmux-splits
Remove unncessary Fugitive keymaps from YADR
Replace whitespace plugin with vim-better-whitespace

Also, don't highlight whitespace in unite.vim windows
Don't use OS's clipboard for yanks

Also, rename yadr-keymap.vim -> keymap.vim
Add tmuxline plugin
Change hlsearch map to '//'

<C-l> is taken by window navigation.
Add Turbux plugin + settings
Set quickfix commands to always open in window

e.g. for Ggrep, etc.
Turn on spell checking in Git commit messages