interpreted now works off a dict. mode, data, interpreted
calling data, bundle_info for consistency
Merge branch 'refs/heads/upstream/master' into detailed_interpret_of_worksheet_items

Conflicts:
	codalab/lib/worksheet_util.py
Merge branch 'refs/heads/upstream/master' into detailed_interpret_of_worksheet_items
correct new_items for image and html

been sitting on this change. just forgot to commit it.
Merge pull request #81 from codalab/feature/detailed_interpret_of_worksheet_items

interpreted is now a dict allowing more flexibility what you do with the data.