Added .travis.yml
Added .travis.yml

Closes https://github.com/PistonDevelopers/event_loop/issues/70

bvssvni/piston,PistonDevelopers/piston,PistonDevelopers/event_loop,bvssvni/piston,PistonDevelopers/piston,mitchmindtree/piston,placrosse/piston,caldwell/piston,axelmagn/piston,oldmanmike/piston,bvssvni/event_loop,getynge/piston,KevinFrans3/piston,tempbottle/piston,Potpourri/piston