Given a group id, delete it from the database along with all its associations.

• return: True if the delete was successful. False if not.

• integer $id: The group's id to delete

Load a group from the database by its id

• return: The group if found. If it's not found, then false

• integer $id: The id of the group to load

Given a group object, update its attributes in the database.

• return: True if the update was successful, false if not

• mixed $group: The group to update