chore(travis): disable safari and internet explorer tests on travis
chore(travis): disable safari and internet explorer tests on travis

Closes #1538

ronlobo/angular.dart,SibuStephen/angular.dart,trinarytree/angular.dart,trinarytree/angular.dart,winstonewert/angular.dart,ronlobo/angular.dart,ronlobo/angular.dart,hitesh97/angular.dart,rkirov/angular.dart,trinarytree/angular.dart,rkirov/angular.dart,trinarytree/angular.dart,SibuStephen/angular.dart,hitesh97/angular.dart,hitesh97/angular.dart,rkirov/angular.dart,winstonewert/angular.dart,hitesh97/angular.dart,winstonewert/angular.dart,SibuStephen/angular.dart,winstonewert/angular.dart,rkirov/angular.dart,SibuStephen/angular.dart,ronlobo/angular.dart