Matching of absolute path in Windows

[kep-w]

When we use thriftpy.load(path, ....) function. if the path is absulute path, after urlparse, the scheme is 'c'/'d'/'e', and the judgment here will not be matched. So this change can make the module more friendly to Windows.

[ethe]

Thriftpy was not supported any more, it merged into thriftpy2 with https://github.com/Thriftpy/thriftpy2/pull/8, thanks!