Added a reference to docs on readthedocs.
Added a reference to docs on readthedocs.

Finally got them working with mock modules, which is the solution given
here:

http://read-the-docs.readthedocs.org/en/latest/faq.html#i-get-import-errors-on-libraries-that-depend-on-c-modules

datreant/datreant.core,datreant/datreant,datreant/datreant.core,datreant/datreant,dotsdl/datreant,datreant/datreant.data,andreabedini/datreant