Update Robo task to compile assets

- renamed compile:javascript to compile:js
- renamed compile:styles to compile:css
- added compile:all to compile all of our assets
- added compiled js & css to gitignore
- removed console.log from src/admin.js

assets/js/src/admin.js

@@ -3,7 +3,6 @@ define('admin', [
     'jquery',
     'handlebars',
   ], function(MailPoet, jQuery, Handlebars) {
-  console.log('admin.js', MailPoet, jQuery, Handlebars);
   jQuery(function($) {
     // dom ready
     $(function() {