jshint supports console
remove marionette. add jquery & requirejs-text
add util class to show screen/Views
init screens using Backbone View & templates, wip

- Underscore templates at folder templates
- Templates are loaded by Screen classes
- Main app display & switch screen accordingly
- Currently, only display intro screen & dummy main screen
change container IDs. Use jQuery from CDN
Modify build script to use jQuery from CDN

include fake jQuery loader for solving 'undefined missing jquery'
problem when building the minimized version