Update README.md

added instructions for a very useful feature of tmux. How to use two tmux default layouts.
Merge pull request #135 from morenoh149/patch-1

add instructions for using tmux built-in layouts
Add some nice vim settings
Changed tab size from 8 to 2
Remove normal line numbers
Added nowrap
Update vim handlebars to better version
Add es6 syntax support
Default tmux key bindings don't work
I have no idea what's new about this commit