[Public WebGL] Spec updated made, please review

[Chris Marrin <cmarrin@apple.com>]

I've made several changes to the spec:

Section 1 
	- Added a paragraph stating that the spec not the GLES man pages are the final authority.

Section 2.2, 5.13 and 5.13.1
	- Changed getDrawingBufferSize() to a pair of readonly attributes:drawingBufferWidth and drawingBufferHeight

Section 2.2 and 5.2
	- Added preserveDrawingBuffer flag to WebGLContextAttributes and text explaining it.


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