Updates to pygsw==0.9

Ported some functions to pure C for improvements in download and dataset
request times.

See:
https://docs.google.com/spreadsheet/ccc?key=0AgGScp7mjYjydDRqbndZRU9vblVKMEtQUUxrSGlUR2c#gid=2
Bump
Merge pull request #1146 from lukecampbell/pygsw-bump

Pygsw bump