Bug fixed regarding group name in user dashboard

Now group names are displayed in user dashboard under all created and contributed resources.
As we have changed the group_set field with list of group id's , group names were not displayed in user dashboard. Now code is updated according to group id's

Modification in : 
```
userDashboard.html    --> Included tag as 'get_group_name' to find out group names from their id's
ndf_tags.py   -->  Included get_group_name() method 
```