travis: test node 0.12 (remove node 0.11)
travis: test node 0.12 (remove node 0.11)

reinaldo13/superagent,fredigato/superagent,reinaldo13/superagent,thejameskyle/superagent,mvanlonden/superagent-webpack-client,ccapndave/superagent,brainbytes/superagent,sutoiku/superagent,simonvizzini/superagent,wushuyi/superagent,targos/superagent,ccapndave/superagent,alinz/superagent,geminiyellow/superagent,KingMario/superagent,killerlayup/superagent,noikiy/suberagent,brotchie/superagent,stasha/superagent,yeatszhang/superagent,yussan/superagent,soyuka/superagent,RubenVerborgh/superagent,jarvisaoieong/superagent,focusaurus/superagent,simonvizzini/superagent,aaroncrows/superagent,visionmedia/superagent,fredigato/superagent,targos/superagent,geminiyellow/superagent,zsh2938/superagent,craigspaeth/superagent,sebastianvera/superagent,puterakahfi/superagent,drinks/superagent,stanzi83/superagent,modulexcite/superagent,modulexcite/superagent,KuroGuo/suberagent,killerlayup/superagent,thejameskyle/superagent,focusaurus/superagent,yussan/superagent,drinks/superagent,RubenVerborgh/superagent,kmalakoff/superagent-ls,nemisj/superagent,philipshurpik/superagent,sutoiku/superagent,jarvisaoieong/superagent,wushuyi/superagent,kmalakoff/superagent-ls,KingMario/superagent,KuroGuo/suberagent,puterakahfi/superagent,stasha/superagent,yeatszhang/superagent,noikiy/suberagent,brainbytes/superagent,mvanlonden/superagent-webpack-client,soyuka/superagent,andyburke/superagent,ertrzyiks/superagent,ertrzyiks/superagent,deltreey/superagent,eligolding/superagent,brotchie/superagent,visionmedia/superagent,eligolding/superagent,zsh2938/superagent,philipshurpik/superagent,andyburke/superagent,nemisj/superagent,stanzi83/superagent,alinz/superagent,aaroncrows/superagent,h1bomb/superagent,h1bomb/superagent,deltreey/superagent,visionmedia/superagent,sebastianvera/superagent,craigspaeth/superagent