Management Mode

[yanniboi]

• We need to replace the tab content region with drag and drop regions
• We need to render the blocks as draggable objects that also show configurable fields (eg. title, display mode)
• We want to have a render callback for blocks in 'manage mode' similar to the callback for the blocks now, so we can update the page with ajax.

[yanniboi]

I'm going to start working on rendering the individual states of tabs and content in management mode via ajax.

[yanniboi]

This is connected to #62