Epydemic

- Fixed problem removing edges, removed some debugging messages
that'd stayed in somehow

- Fixed behaviour when network is adaptive (add/remove nodes/edges)
- Added CompartmentedModel.getCompartment()

- Moved development to Python3.7
- Added "wheel" distribution format, updated to simpler build system
- Fully merged process-refactor branch
- Updated library dependencies
- Added an interface to evolve and interact with the network, which means that
things compose more cleanly
- Removed a lot of unnecessary parameter-passing after the refactoring, including
simplifying event functions and compartment management
- Added posting of repeated events
- Added cookbook article on monitoring processes
- Added recording time an edge became occupied
- Added some badges to README.rst

- Added SIRS model of partial-in-time immunity
- Seperated process from dynamics
- Fixed rates
- Added cookbook of recipes for use

- Fixed bug in the event selection routine for Gillespie dynamics
- Added shuffling of events to avoid anomalies in event selection
- Syntax changes to be Python3 compatible
- Made test/CompartmentedDynamicsTest a mixin to avoid incorrect test calls
- Introduced nose and tox for testing against multiple Python versions
- Changed compartmented models to return a flat dict of results with just
the final sizes of each compartment
- Changed documentation to a more tutorial format

- Maintenance release to fix compatibility with NetworkX 2.1