Memory improvements#2

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martinheidegger wants to merge 3 commits intomicro-js:masterfrom

martinheidegger:feature/memory-improvements

Commits on Sep 27, 2016

Using "undefined" as default for listeners to make sure that the memory is not unnecessarily preallocated.
martinheidegger
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Allowing listeners to be reduced to none and the memory of the array is dereferenced.
martinheidegger
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Reduction of memory: don't create an Array for the first listener
martinheidegger
committed