FOSRest: Config changed so IE doesn't load the page as JSON due to IE dumbness.
CMSPage: Rework/rearrange of variables so debug/production/etc settings available to Backbone, and other variables are now in the correct places.
CMSPage: BlockCRUD - GET block now loads its children as well. 
As an aside, Backbone's Block will populate child relations correctly via REST, too. Yeaaah.
WIP COMMIT:
CMSPageJS: Layouts and Backbone
 - Layouts can now be added to a layout via toolbar.
 - Layouts fetched from REST API.
 - CMSPage.blocks.addLayout creates a form from which you choose the layout to add.