chore(travis): move checks from before_scripts to scripts
chore(travis): move checks from before_scripts to scripts

If jshint (or any other ci-check) fails, Travis marks the build as "Errored" which I don't think is desider:
https://travis-ci.org/angular/angular.js/builds/14938896

ammula88/angular.js,ammula88/angular.js,ammula88/angular.js,ammula88/angular.js,ammula88/angular.js