Update .travis.yml with xcode_project specification
Update .travis.yml with xcode_project specification

herinkc/HTPressableButton,herinkc/HTPressableButton,Famolus/HTPressableButton,piercefreeman/HTPressableButton,Famolus/HTPressableButton,Famolus/HTPressableButton,qingpengchen2011/HTPressableButton,qingpengchen2011/HTPressableButton,qingpengchen2011/HTPressableButton,piercefreeman/HTPressableButton,piercefreeman/HTPressableButton,herinkc/HTPressableButton