Fix readthedocs build #668
Merged
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Fixes #667
The sphinx version is pinned by readthedocs, but sphinx 1.3.5 is not available with conda python 3.6. The workaround is to pin the python version to 3.5 (it doesn't really matter for the docs build).
Note: This PR also reverts #582 because it produces compiler errors on all platforms and the CI tests don't pass otherwise. If there is some other plan for that, let me know and I'll remove it from this PR.