Merge pull request
#1262 from minrk/hbgil
Heartbeat no longer shares the app's Context
Fixes in both the single and parallel kernels, preventing the heartbeat thread from sharing the zmq Context with the rest of the process. Non-copying sends require grabbing the GIL from the zmq io-thread in order to free memory, which could let Python get in the way of the heartbeat.
Test script and notebook added to examples directory.
closes
#1260
