several method tested and done.
friendships methods tested and done.
get friend subscriptions tested and done!
subscription groups create, delete and get methods tested and done.
create subscription method tested and done.
delete friend subscription with user.
user join subscription group and remove user from group methods tested and done.
update friend subscription group methods tested and finished.
get friend news tested and finished.
reorder position in subscription group method bug fixed.
unit test method bug fixed
bug fixed.
bug in unit test fixed
remove useless parameters
simplified .m file.