Teach read.neuron to handle a zip archive of multiple neurons
Teach write.neuron to write multiple neurons to a zip file
Move zip archive reading logic to read.neurons and document
Move zip archive write logic to write.neurons and document
path should _end_ in zip
avoid partial arg match to keep check happy
swallow warnings in test
Merge branch 'ajdm-zip_neurons'

* ajdm-zip_neurons:
  swallow warnings in test
  avoid partial arg match to keep check happy
  path should _end_ in zip
  Move zip archive write logic to write.neurons and document
  Move zip archive reading logic to read.neurons and document
  Teach write.neuron to write multiple neurons to a zip file
  Teach read.neuron to handle a zip archive of multiple neurons