Symfony: Changes required for Symfony 2.3 update.
Note: Symfony 2.3 is a LTS release, and the long-term target version for this application.
CMSPageBundle: PageCore.util added to library.
Currently used for date functions
Created @cmspagecore asset bundle for Assetic.
Changed base template to use @cmspagecore asset bundle.
Configuration changes for Assetic to enable SASS and Compass filters.
Misc. formatting changes.