Bump version

1.0.13 got released, let's bump the version
Upgrade version string in autogenerated docs
Merge pull request #172 from ferrix/docver

Upgrade version string in autogenerated docs
Fix error from readthedocs.org

    /latest/docs/index.rst:385: WARNING: Definition list ends without
    a blank line; unexpected unindent.
Fix import path

Apparently readthedocs does not find the cumulus package. Let's try
explicit.