Change button + nav color to match theme
Change button + nav color to match theme

Summary:Some colors were left over from the flux template. So, I got rid of the greens and threw in some reds.
Closes https://github.com/facebook/draft-js/pull/94

Differential Revision: D2980484

fb-gh-sync-id: d7567b098f05195b6d336f12410e8ccc2482f00e
shipit-source-id: d7567b098f05195b6d336f12410e8ccc2482f00e

tonygentilcore/draft-js,TripleDip/draft-js,dirkholsopple/draft-js,davidchang/draft-js,dirkholsopple/draft-js,tonygentilcore/draft-js,SciMts/draft-js,johnmpotter/draft-js,brookslyrette/draft-js,davidchang/draft-js,facebook/draft-js,brookslyrette/draft-js,SciMts/draft-js,TripleDip/draft-js,johnmpotter/draft-js