Missing files in the PyPi tarball

Hi,

The setup.py has the lines:

```
package_data={'': ['LICENSE.txt',
'README.md',
'requirements.txt']
},
```

But the license and requirements files are not present in the 0.2.5 tarball, thus it is not possible to install the package from source.

Start by inspecting setup.py and rebuilding the 0.2.5 source distribution. Compare the resulting PyPI tarball contents with the expected LICENSE.txt and requirements.txt files; done means both files are included and the package can be installed from the source archive.

Written by the indexing model from the issue text.