CLIMATE-411 - Add overview section to sphinx docs
CLIMATE-554 - Switch sphinx metrics page to autodoc
Resolve CLIMATE-411. Merge PR #134.
Resolve CLIMATE-554. Merge PR #135.
CLIMATE-555 - Update sphinx doc version

- Update version number to 0.4-snapshot.
- Fix really really old copyright that was never changed after initial
  testing.
Resolve CLIMATE-555. Merge PR #136.