Correct key assignation for Node output
Correct key assignation for Node output

Previously this would have failed for connections of the type:

    nengo.Connection(a, b)

although it would have worked for connections of the type:

    nengo.Connection(a, b[0:4])

project-rig/nengo_spinnaker,project-rig/nengo_spinnaker,project-rig/nengo_spinnaker