[#1946] Upgrade Sphinx to 1.2.3
Upgrade sphinx-rtd-theme to 0.1.6.
[#1946] Fix a couple of Sphinx errors
[#1978] Don't include datasets on get_organization helpers

They are not really needed and decrease significantly the performance
Merge pull request #1978 from ckan/1978-dont-include-datasets

Don't get all datasets when loading the org in the dataset page
Update CHANGELOG after 2.0.5, 2.1.3 and 2.2.1 release
Merge branch '1946-fix-sphinx-html-build'