Removed unused imports

Ignore-this: 8be288516bd38103c0ffb9d1feead869

darcs-hash:20100907090802-56b4d-54ce90ef900168d2b61336be03c9147706979c79
End MWI subscription before ending registration

Ignore-this: 75f7a11ed7630ae1e736903508b0df6d

darcs-hash:20100907102418-56b4d-fcfb0fa424b0b094bf9499d1960af63d05d77c15