Note File Uploads and Other Updates

1. Added popup help to data import modal.

2. Re-enabled document filtering in datatables.

3. Added pagination to uploads.

4. Files (uploads) can be added as notes to collections.

5. Files (uploads) can be added as notes to documemts

6. All Note files can be downloaded.

7. Made "uploads" more accessable and more managable.  Added bootstrap
formating.

8. Moved document filter job creation code to helper function.

9. Added new pre-defined filter "no-filter note".

10. Added CanCan access control permissions for uploaded notes.

11. Added two HABTM tables for collection notes and document notes.

12. Added an "upload type" field to uploads.

13. Minor UI tweaks.

14. Updated routes for note download actions.

Signed-off-by: shanesuofi <shanes@vandals.uidaho.edu>