Various tweaks and bug fixes to the IO layer to improve performance and eliminate some deopts in v8/spidermonkey
Fix some more erroneous uses of Stream.Read
Fix bug in text decoder when passed a count of 0
Unmarshal/marshal codegen tweaks for better performance
Tweak $makeImageDataForBytes to be considerably faster
Stop throwing exceptions on unhandled primitive types, because it's annoying
Add ProceduralTextures to the demo build list