Added autoUpdate functionality #9
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When autoUpdate is enabled, the mask will be re-applied anytime the display list changes. It is off by default for backwards-compatibility. autoUpdate works by overridding methods such as addChild and removeChild. This means that if someone was to repeatedly call those methods (in a loop for example) there would be a performance impact.
I decided to add the autoUpdate param in the constructor. I think it makes sense but I'll let you decide. Cheers!