Make travis build the 2.0 branch
Make travis build the 2.0 branch

This branch will be the target of pull requests, so I'd like to have CI
running on it as well.

naveed-ahmad/clearance,naveed-ahmad/clearance,benlivermore/clearance,zernie/clearance,janusnic/clearance,thoughtbot/clearance,zernie/clearance,thoughtbot/clearance,thoughtbot/clearance,naveed-ahmad/clearance,zernie/clearance,pedrosmmoreira/clearance,pedrosmmoreira/clearance,janusnic/clearance,benlivermore/clearance,sferik/clearance,janusnic/clearance,benlivermore/clearance,pedrosmmoreira/clearance