Continuous integration

* Added support for Travis-CI service, you can look an example on [my Travis account][1], you need to create an account for yourself.
* Added support for [Coveralls.io][2], you need to create an account for yourself in [Coveralls.io][2], also, you need to install [python-coveralls][3] and execute from the command line: `COVERALLS_REPO_TOKEN=your_repo_token coveralls` (look in your repository info), and **that's all!**, [TravisCI][1] will be the responsible for generate your `.coverage` file needed by [Coveralls.io][2]
* Added support for [sphinx_rtd_theme][4] in your local documentation, it's a beautiful theme :+1:
* Added support for [tox][5] with some environments for: Python 2.6, Python 2.7, Python 3.3, PyPy. Also added flake8 as a style checker, last but not least, added some automated documentation checks.
* Fixed some documentation errors in order to pass the build.
* Added some badges in the README.rst, please, update the links after you create your Travis and Coveralls.io accounts.

Please, if you have any problem don't hesitate to reach me.

[1]: https://travis-ci.org/milmazz/libturpial/builds
[2]: https://coveralls.io
[3]: https://github.com/z4r/python-coveralls
[4]: https://github.com/snide/sphinx_rtd_theme
[5]: https://bitbucket.org/hpk42/tox/