Updates to support (and require) Yeadon > 1.1.0.

Fixes issue #18.

- Changed Yeadon input files to YAML.
- Changed the data files to have the new Yeadon configuration names.
- Added a better implementation to position the rider on the bicycle, which
  also fixes issue #11.
- Increased somersault angle for Jason on the Browser for computation's sake.
  See issue #19.
- Fixes plotting the rider to work with the new Yeadon API.
- Fixed some Sphinx errors in the docstrings.