#664 checkboxes on table rows
#664 checking or unchecked a table now checks or unchecks all of its rows, but rows can still be checked individually as well
Merge branch 'refs/heads/feature/worksheet_interface' into feature/664-checkboxes-on-rows
Merge branch 'refs/heads/feature/worksheet_interface' into feature/664-checkboxes-on-rows

Conflicts:
	codalab/apps/web/static/js/worksheet/table_bundle_interface.js
	codalab/apps/web/static/js/worksheet/ws_mixins.js
Merge branch 'refs/heads/feature/worksheet_interface' into feature/664-checkboxes-on-rows
Restore checkboxes on rows and delete functionality (front-end only), refactor save() and setItem() to work for bundle types other than markup
comment out deleteCheckedRows