Prepare to version 1.0.0. 

First, thanks for the good library.

I send pull-request. Because I was added to fix some.

- Fix for os_version.
- Add some test case.
- Fix for follow to PEP8 coding style.
- Python3 support.(in addition to python2)
- Prepare to upload PyPI(https://pypi.python.org/pypi)

I'm using Travis CI and Coveralls for test. You can check from the following URLs. 

- https://travis-ci.org/tell-k/woothee-python
- https://coveralls.io/r/tell-k/woothee-python

Please feel free to merge it.

I'd like you to update Travis CI and Coveralls URL in README.rst. And upload it to PyPI.
If there is anything I can cooperate for, please tell me.