Update mocha dependency to version 0.12.7
Update mocha dependency to version 0.12.7

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