Vivarium

- Move handle_exceptions() up to vivarium to eliminate duplication

- Bugfix for lookup table input validation.
- Event subsystem documentation.

- Add names and better reprs to some of the managers.
- ConfigTree documentation
- Yaml load bugfix.
- Documentation for ``simulate run`` and the interactive context.
- Tutorials for running a simulation interactively and from the command line.
- Headers for API documentation.
- Component management documentation.
- Enforce all components have a unique name.
- Add ``get_components_by_type`` and ``get_component(name)`` to
the component manager.
- Bugfix in the lookup table.

- Add simulation lifecycle info to the simulant creator.
- Bugfix in simulate profile.

- Update results writer to write new hdfs instead of overwriting.

- Fix numerical issue in rate to probability calculation
- Alter randomness manager to keep track of randomness streams.