WIP: ui/permanode.js: clean up

-removed redundant "gallery" feature (since container aspect does it)
-> allowed to get rid of blob_item_container dependency.

-removed the whole resolvedMetaData business. If one wants to derive
properties (such as the title) from children blobs/permanodes, just
create a new BlobItem for that child and get the properties with
methods on that child.
-> makes for clearer code, and easier to prevent null errors.

-made the describe request "deeper" so the response has a description
for the needed children with foursquare/twitter related permanodes.

Change-Id: Ic706c96e1c05ad5489ab4b14ed21e315a557a8a8