Bug fix for Group dashboard and other improvements

**What to test?**

1) Default landing group i.e. home, are you getting group's new dashboard for it?
2) On click of site's logo (on top-left corner), are you getting group's new dashboard url of home group?
3) Can you see any edit facility open for anonymous user on group's new dashboard for any group?
4) Try adding picture for group's banner as well as profile and see whether any issues arise?
5) Only for MIS: In Course announcement UI, see that in university listing only universities registered under MIS_admin group are coming! 

<hr/>

**Check implemented for editing feature on group dashboard**
1) templates/ndf/group_dashboard.html
  - Only logged-in users can have access to edit feature

**Other improvements**
1) views/course.py
  - Fetch colleges which are registered under MIS_admin group

2) views/home.py
  - 'home' group's url modified to redirect to group's new dashboard url.

3) views/userDashboard.py
  -  Fetch has_profile_pic and has_Banner_pic, only if both have values respectively in their corresponding node's relation set.

4) templates/ndf/base.html
  - Logo's (top-left corner) url changed to 'home' group's dashboard url. 

5) views/userDashboard.py
  -  Bug fix (Group dashboard) - If saved image is found then only create grelation (has_profile_pic/has_Banner_pic).