Release 0.1.0.

Problem description
===================

Releasing a version and publishing it on PyPi will easy the way other peope can use the code from  txgithub.

This should help with testing and integrating txgithub into buildbot.


Changes description
===================

I have prepared the setup.py to be published on PyPi.

I added a Changelog, but it is rather a release log / release notes. Feel free to delete/change it.

If you want, I can publish the package on PyPi under my account and add you as author/maintainer.

Any change of releasing this under BSD/MIT, Twisted like license?  


How to try and test the changes
===============================

reviewers @tomprince

Check that the package definition is correct and the package can be installed.

```
python setup.py sdist
virtualenv venv
source venv/bin/activate
pip install dist/txgithub-0.1.0.tar.gz
```

Thanks!