FOSRESTBundle: Config changed to default to JSON.

NOTE: This probably breaks IE7 support. Care factor?
CMSPageBundle: CoreJS - Variables now separate file
CMSPage: BlockManager->createRootBlock() completed

- Creates the root block with a blockInstance of a layout block nested
in it
CMSPage: Page creation

- PageCRUDController can now be POSTed a new page
- PageManager can now create a brand new page
CMSPage: CoreJS - Pages

- Page model created.
- CMSPagePages->add() - create new page from Backbone form
-
CMSPage: CoreUI / CoreBlocks

- showModalDialog moved into CoreUI.
- CoreBlocks modified to suite prior change to showModalDialog