Prune examples, modify to fit new API.
Changes to track Nengo.

Minimum changes to EnsembleVertex and Builder to get things to run.
Remove unused connection type.
Should make config work
Correct default decoder
Merge pull request #46 from ctn-waterloo/nengo-temp

Nengo Tracking
Merge branch 'master' into inhibition

Conflicts:
	nengo_spinnaker/ensemble_vertex.py