ContextAttribs and PixelFormat builder without unexpected behaviour#4

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gmacd wants to merge 2 commits intoLWJGL:masterfrom gmacd:master

+466-394

Commits on Nov 20, 2012

Make ContextAttribs and PixelFormat mutable
gmacd
committed

Commits on Nov 24, 2012

Make PixelFormat & ContextAttribs fully immutable and implement Builders
gmacd
committed