Fixed compilation with Cython 0.19

Ignore-this: a28b5ba6403aeb2e9c63b938888e635b

darcs-hash:20130603081415-56b4d-7a8483d2fd2b640e81b67be6c1244b2be8ed620b
Silence compiler warnings

Ignore-this: 5beb685846ce65f20c8dcb52243082c7

darcs-hash:20130603092620-56b4d-84a92339dd15466d06489d0ec8e72904a81cf34c