Test against ruby2.0 in travis-ci
Test against ruby2.0 in travis-ci

betesh/whenever,stpn/whenever,Dearest/whenever,Insomniware/whenever,bernabas/whenever,rafaelsales/whenever,thehungrycoder/whenever,erikdahlstrand/whenever,lzheng571/whenever,bangwu/whenever,HonoreDB/whenever,ctokoro/whenever,medictrust/whenever,makandra/whenever,javan/whenever,Nguyenanh/whenever,shtzr840329/whenever,attilahorvath/whenever,mindvalley/whenever,sideci-sample/sideci-sample-whenever