Generalize assets to any block_type but using
AssetKey and the metadata store
PLAT-204
Merge pull request #5847 from edx/dhm/generalize_assets

Generalize assets to any block_type but using
Skip test broken on master. Sent to team for review.
Merge pull request #5865 from edx/benp/skip-broken-MA-117

Skip test broken on master. Sent to team for review.
The Django @require_POST decorator is cool.