Add support for "smart updates" of filters. Add smart update of unload event. #242
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Assume the following scenario:
Due to the unload delay in Racer and how filters work (basically, rerun everything on every little event), you'll end up with perf problems if you have the above scenario. Specifically, we had a simple scenario where we'd have a significant amount of docs (100-1000) unloading, which caused a lot of reruns of the ids fn. This caused the browser to hang.