CMSPageBundle: CSS fixes
Symfony: Updated composer.json for assetic @dev.
Removed ACMEDemoBundle. >_>
Removed jQuery, Backbone and Bootstrap from version control. 
Main template updated to use resource bundles in assetic.

3rd party JS libs are now to be located in app/Resources/public/js/
Enduser must install by hand. 

TODO: Documentation update required still.