Switch theme back to default to make ReadTheDocs happy.

Merge pull request itamarst#161 from ClusterHQ/upgrade-versioneer

Upgrade to versioneer 0.14.

Merge pull request itamarst#139 from ClusterHQ/unicode-files-135

Make Unicode files work.

Fixes itamarst#135.

Merge pull request itamarst#124 from ClusterHQ/failing-test-123

Don't rely on dictionary order.

Fixes itamarst#123.

Merge pull request itamarst#74 from hybridcluster/release-0.4.0-60

Release 0.4.0.

Fixes itamarst#60, itamarst#75.

Get rid of reference to internal issue tracker.