Update mocha dependency to version 0.12.6
Update mocha dependency to version 0.12.6

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