Despy

- More examples

- Include simkit.examples in distribution

- Some standard random variates
- Uses keyword arguments or keyword map for instantiation
- Event arguments implemented
- SimEventListener implemented
- StateChangeListener implemented
- Simple Stats Tally & Time-varying
- Multiple Simple Stats Tally & Time-varying
- A number of standard Event Graph models implemented in simkit.examples

- Basic functionality
- Tested on simple "Pinger" class
- No random variate (yet)
- Event arguments not tested
- Priority enum with int values
- Using None as default when scheduling SimEvents