Merge pull request #5 from ricafett/master

added sphinx documentation
Added LICENSE to wikipedia updater.
Merge branch 'master' of https://github.com/cidles/poio-corpus
Updated semantics and prediction update script.
Added imprint, privacy and licenses pages.
Updated README with correct download menu option.
Updated clean script for orwiki.
Added developers.rst to docs.
Added link to readthedocs on documentation page.
Added clean script for Chechen.