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Pre-LD Update
A quick fix to only fire back button events on Windows Phone if they weren't handled/fired yet
Implemented NormalizedByte4.
Added tests for NormalizedByte4.
Fixed bad formatting.
Implemented NormalizedByte2.
Merge pull request #2205 from SickheadGames/NormalizedByte

Implemented NormalizedByte4/Byte2
Added NormalizedShort4 and NormalizedShort2 to test suite.
Fixed bugs in NormalizedShort2/4 causing incompatibility with XNA.
Fixed Bgra4444 to properly clamp input values.
Fixed packing order of Bgra4444.
Added more tests for Bgra4444.
Added tests for Byte4 type.
Added Short2(), Short4(), and Bgr565() tests.
Fixed incorrect packing in Short4.