quick refactor of ws_actions
Basic run command.
Merge branch 'refs/heads/upstream/feature/worksheet_interface' into feature/run_bundle

Conflicts:
	codalab/apps/web/static/js/search/ws_actions.js
Merge branch 'refs/heads/upstream/feature/worksheet_interface' into feature/run_bundle
refactor of ws_actions, now has a queryfn
always find a command
Refresh worksheet after adding bundle

- Pass WorksheetItemList's fetch_and_update to WorksheetSearch. When WorksheetSearch does executeCommands, it passes the method as a callback to the add command's executefn. The callback is called after succesful POST.
dynamic run bundle input

to see in action either use program:bundle or type 'commands'
Merge branch 'feature/run_bundle' of github.com:codalab/codalab into feature/run_bundle
able to run a bundle with inputs/keys

issue #760