`NengoVertex` and related functionality for automatic region generation.
`NengoVertex` and related functionality for automatic region generation.

 - Vertices subclass `NengoVertex`
 - Mark methods as `@region_*` to indicate tasks performed

ctn-archive/nengo_spinnaker_2014,ctn-archive/nengo_spinnaker_2014,ctn-archive/nengo_spinnaker_2014,ctn-archive/nengo_spinnaker_2014