We may need the full class name (I'm sure why :S)
We should copy nested blocks into its parent's page
Now that we have 'roots' blocks, we need a way to scope them so we don't show every block in pages#show
Nested blocks must disappear when the parent block is destroyed
We were not sorting blocks so they were not shown according to their positions

We need a default block position for newly created ones
Merge branch 'features/nested-blocks'