Do not Compile Cython.

Looking for the same speedups as at
https://github.com/Toblerity/Shapely/pull/207
Merge pull request #211 from mapbox/cython-travis-fix

Cython travis fix
Added numpy style docstrings and additional tests for transform_geom
Merge pull request #204 from alculquicondor/master

Raise 'Invalid band index' for values <= 0
Merge pull request #213 from brendan-ward/update_warp_docstring

Warp.py docstring wins