Ordering of Files updated in respective tabs


**1. Page creation bug resolved**
- Files modified:

  1) models.py
     - member_of_names_list() function updated
   
**2. Ordering of Files updated in respective tabs**
- Recently updated/created file is shown first in the listing.
   
- Files modified:
   
   1) views/file.py
       - sort("last_update", -1) function applied to respective cursor objects that are rendered to the template

**3. Document-tab updated in files listing**
- Lists all document-files
   
- Files modified:
   
   1) templates/ndf/file.html
      - Required code added under id="view-doc"

**4. Few urls updated**
- Files modified:
   
   1) urls/file.py
   2) urls/image.py
   3) urls/video.py