The deleteGroup method is used to delete a group the user is a member of. Any existing member of the group can delete the group. The developer can choose to build stricter access-control mechanisms on top of this if desired (e.g. only the group-owner or group-admin is authorized to delete the group).
Method parameters :
groupId : Group Id of the Group.
success : Success block to be executed after group is deleted.
failure : Failure block to be executed if group could not be deleted, returns BayunError.