Add comment on 'laststatus' to the README

Judging from #vim activity, few read the help all the way to the FAQs.
Add kolor theme
Improve some colors
Merge pull request #380 from zeis/master

Add kolor theme
Merge pull request #379 from phy1729/master

Add comment on 'laststatus' to the README
specify maximum for whitespace checking. resolves #378.
improve performance when showing tabs in the tabline (#326).