Resolved bug related adding user in group

bug : http://glab.metastudio.org/issues/129 
If a user is added even then the name reflects in the search box and the system does
not give oa notification that the name has already been added.
If the user id is added again then the system accepts it and the total no of users increases.

In the users list I can see that a username reflects twice. .ie. as per my earlier post we must have added the user twice..

Resolved : Now on word after subscribed some user you wont see in the drop down list(input auto couplet)

bug :http://glab.metastudio.org/issues/128
In Group dashboard A group owner can add single user again.even he is already subscribed to that group

Resolved: prevent adding same user again and again