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This PR starts the fsevents observer on the main thread, allowing the auto command to pickup file changes and run the appropriate tasks. This may address #49 (and possibly #101) by fixing the current implementation without moving to using Watchdog.
The filewatcher test fails on OS X both before and after this patch, but testing the auto command manually after applying the patch seems to show that the auto command works. I am unaware if there are any unintended consequences of running the observer on the main thread though as I have no previous experience with fsevents.