Don't use strict property lookup to implement getDefinitionByName.
Don't create empty objects for Loader parameters since they need to behave like AS objects.
Return an empty filter array if no filters are assigned.
Use rounding in `Matrix.computeBounds` computation to match Flash behaviour.

I actually ran into content that was testing the width/height of an object and throwing if they didn't match some hard coded constant.
To really match Flash behavior we need to start using fixed arithmetic, but hopefully this will do for now.
Merge pull request #1656 from mbebenita/starbucks

Starbucks