build one package with two extensions

[twAlexM]

This should fix #58.

setup.py calls distutils.core.setup twice, with two different ext_modules. This might have worked in the past, but the wheel mechanisms don't like it. Fix this by passing two Extension objects to setup().

[tucked]

@rjancewicz Please review.

[binc75]

I would appreciate too this merge so that we can use plain pip to install this fantastic library

[tucked]

@nightfly19 wanna take this PR and publish as kadmin? It WFM: https://travis-ci.com/Isilon/isilon_hadoop_tools/jobs/246341511#L244