fix(travis): BUILD_LEADER is not available in build.sh
fix(travis): BUILD_LEADER is not available in build.sh

Replace with check that TRAVIS_JOB_NUMBER ends at .1.

Closes #1362

Closes #1393

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