Better stopping behaviour for snips #27
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We now send an explicit stop signal, and once that is received the snip will just return immediately.
We needed better stopping behaviour for working with nengo_gui (since we don't know when the simulator might be closed). It also handles pressing Ctrl-C while your model is running, which might be handy.
[EDIT:] This PR may need to be re-thought in terms of making it fit with #26 , which made some big changes to the communication protocol between chip and host.