Convert body ids to classes.
Fix #487

This seems like a cheap fix to me, but the problem is that Element validation happens in ItemType::saveAfter(), so the errors on the Elements happen late. I'd love it if there's a better solution, but one escapes me.
Merge branch 'master' of https://github.com/omeka/Omeka
Update translations from Transifex.
Update submodules.
Update version to 2.0.1.
Update theme submodules.
Update Coins submodule.
First crack at #486.

Major changes:
-View\Body collapsed to View
-Navigation\Link and collapsed to Navigation
-View\Head and View\Foot collapsed to View\Layout
-New View\Assets package
-Item\File changed to File or Item as appropriate
Update docblocks for Records.