Use the specific version of cython 0.12.1 for building the package

Ignore-this: 98fb6023c85f656a6ae9841d6a019c29

darcs-hash:20100929074805-58252-a4d347a1363b4dd527e39d68b29e495060dcfa84
Fixed typo.

Ignore-this: 270952a39cf39e40cf5bd573541ca35

darcs-hash:20100929082415-6980e-fc845b3e9aa8f7a8aa4a902fc852098e6e28a376
Fixed typo.

Ignore-this: c7fa0468eadb3a5d0dc67dc183d6c555

darcs-hash:20100929083700-6980e-f9e2019c676e34134b3a220c97f309b67402606a