Deletes a HIT from MechanicalTurk. In order to delete the HIT, this fuction
will first try disposing the hit. If the hit can not be disposed, it will
attempt to force expire the hit and then dispose it. If that operation fails
and the autoApprove flag is on, then submitted assignments will be approved
and another disposal attempt will be made.
Even, if this method fails, the HIT may have been changed. It could have
been force expired, but still failed disposal. Assignments may also have
been approved, even though the last disposal attempt failed.