BUG:DOC: Add main requirements.txt to docs/requirements.txt
BUG:DOC: Add main requirements.txt to docs/requirements.txt

This is needed because we build the api documentation on the fly
with apidoc, and that means we need to be able to import all of
the modules in the package to build the documentation.

scottclowe/python-continuous-integration,scottclowe/python-continuous-integration,scottclowe/python-ci,scottclowe/python-ci