Update mocha dependency to version 0.13.1
Update mocha dependency to version 0.13.1

BryanH/follow-all,codeforamerica/follow-all,codeforamerica/follow-all,jasnow/follow-all,BryanH/follow-all,jasnow/follow-all,BryanH/follow-all,jasnow/follow-all,codeforamerica/follow-all