Use super instead of calling parent class directly

Ignore-this: a52584647a97f485bf8aad5f51dfb358

darcs-hash:20140521093338-56b4d-91a6a6374cd7bb6e0556626f00df920c7b1d5390
Silence unused-function warning caused by cython

Ignore-this: 57cfadb23725bb2e698549a02e02f74c

darcs-hash:20140522093025-56b4d-46aa2518ca8f92511ec94fdbcfbdc784c4ed4e57
Fix use of getattr

Ignore-this: 581783d974c8df07f5ce821ab270c88a

darcs-hash:20140522132348-56b4d-6641c3acfa48327319e94b20cd4ce14005a75690