Added the default Filter for MakeB2FixtureDef to fix the collision issue #30
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Issue reported #28
The problem wasn't initially noticeable, but became apparent after commit a6df559 for anything where collision Filter isn't explicitly set. The problem is that the function that makes the fixture doesn't assign a default collision filter which results in category/mask being set to 0, disabling collision. The Box2D documentation indicates the default should be 0x0001 and 0xFFFF respectively.