v0.1.11

#18: Experimental interrupt feature.

v0.1.10

#11: API trick: eliminate callback parameter with negative star index (needed by ez-streams)
#12: parallelizing with yield [fn1(), fn2()](needs a bit more work)
#14: flamegraph hooks (for https://github.com/Sage/streamline-flamegraph)
#15: reentrancy problem with 2 loops