Fix for downloaded bundles. API change.

fixes issue #736
#740 #735 #734

- Fix bundle permissions
- UI changes to filebrowser
- shift-e to toggle edit mode
- shift-x to check whole table (vs x to check row)
- enter to go to highlighted bundle's details page
- keyboard glossary ui changes and corrections
#733 Don't scroll past last item

Add a check to make sure focusIndex doesn't exceed the length of the worksheet
#738 confirm before deleting items
Comment out ws search bar for demo
Fix table row deletion
Merge pull request #740 from codalab/feature/worksheet_interface

Small Changes and hot fixes for worksheets
Show spinner until ws fully loaded
Merge pull request #741 from codalab/feature/worksheet_interface

Show spinner until ws fully loaded
Fix jslint errors
#742 Change login redirect url to /
#743 Fix bundle metadata saving
#744 rerender mathjax after saving markup
Merge branch 'refs/heads/master' into feature/worksheet_interface
Merge branch 'refs/heads/upstream/feature/worksheet_interface' into feature/673-add-bundle-ui

Conflicts:
	codalab/apps/web/static/js/worksheet/worksheet_interface.js