Updated User group implementation

* Now as soon as user logsin , it will redirect to user group

Implemented : 
```
Added url in --> __init__.py  
Added view in --> home.py 
```
Modification in --> ndf_tags.py

* Now as long as the user in its own group, Its activities are restricted to user group itself.

* If someone wants to create a base resources for which evryone can edit and modify then they must have to be in home group.

* For home group just we need to click on "metaStudio" icon as previous.
* Please dont get confused if previously created resources not visible, since you will be in user group you will see only those resources which you have created. 

* Resources created from home group are visible to all the users in metastudio, but if its created from user's own group it will be only visible to user itself.