Upadte plugins and vimrc config for them.

Change-Id: Ie1dbc9f59f638860ccc75e51f2288cdb011d1cc5
Remove theme from configuration.

I would have a different repository just to hold theme config files for all
plugins that allow themes.

Change-Id: I1990f5499cfaf9206e9d635f7f04be1ff975e008
Add Airline for nice status bar

Change-Id: I60f21b05bfc7470ef290a4554e1822d743857654