Allow zero sized regions (don't reserve or write to them).
Allow no-decoder ensembles, transmit decoded values after neuron updates.
Merge pull request #36 from ctn-waterloo/no-decoders

Ensembles with no Decoders, Update loop modifications
Merge branch 'refactored-vertices3'

Conflicts:
	nengo_spinnaker/utils/vertices.py
	spinnaker_components/ensemble/ensemble-update.c
Fixes to transmitted multidimensional values from ethernet.

(cherry picked from commit ea91dfb0daf828b21418060fa4a22fa7eebe217e)
[Bugfix] SDPReceiveVertex reserved too little space for output keys.

(cherry picked from commit a3d7ddb62bb446f3eef9abef78c467d7d2c9da54)
Fix recursive bug in totuple.  Not sure how it got there.

(cherry picked from commit ae1f7beb5188eaf09fc3f7efc1061a15a12aecf2)
Remove spurious print from filters processing.
Merge branch 'master' into f-of-t-nodes