Use add-batch a bit more
Make UploadCollection not use Backbone.

Our problem, with massive file lists, is that Backbone.Model
constructors create too many temporary objects, which bogs down the
garbage collector. Next we'll change Upload to make it _not_ a
Backbone.Model; but first, we have to make UploadCollection compatible
with that change.
Make Upload _not_ a Backbone.Model.

This is nicer on the garbage collector.
Fix example views
Bump version to 0.0.4