remove groupUsers--

friends Notification-
# check friends Request Notifications
# check friends accepted/denied Notifications on both ends
# remove multiple notifications
# cancel friend Request remove notifications from both ends
# delete friends will remove friends notifications from both ends

groups notification--
# check notifications on added on groups
# check notifications on removing from groups
# check notifications on leaving groups
# remove multiple notifications
# delete group lead to remove all group notifications

moments notifications--
# check add moment notifications on other moments
# check tagged notifications on moments
# check untagged notifications from moments
# check request for tag notifications to Admin
# check accepted/rejected notifications to requested users for moment tags
# check like moment notifications to Admin
# remove multiple notifications
# remove notifications when moment deleted