awareness'

add a delete-all-versions flag to the delete_item method in the modulestores. Extend tests to verify. Still wip

when updating the list of children of sequentials, we must use the 'direct' store otherwise we end up with draft revisions of sequentials, which is bad

#278

get metadata inheritance to work with draft stores. Fix bug on .publish() method whereby inherited metadata got written to the DB as 'own-metadata'. Change filter in mako_module.py to return list of own-metadata and inherited-metadata as 'editable-metadata'. Also, add unit test for draft metadata-inheritance and publish

add unit test to verify that the store updated signal actually fired. Also fix bug where cloning item doesn't update the inherited metadata caches

actually we need to start the draft content export from the sequentials. This is because we need the child pointers to the draft verticals. For private items, if we don't do this, then we'll loose those pointers