TO DO: *NeedsUpdate, CustomAttributes, Skinning, MorphTargets.

Remove unneeded function calls, rearrage for fused multiply–add, remove
excessive shader whitespace

Added both intanced and non instanced interleaved bufferedGeometry

http://blog.kenperlin.com/?p=15869

add ambientocclusion glsl shaders.  Separate out uv/uv2 vertex and fragment shaders to make things cleaner.

Hardware instancing using ANGLE_instanced_arrays for BufferedGeometry

- sourcemaps now work with build.js
- sourcemaps also point to glsl shader files
- enable sourcemaps by default
- display uglify-js unused variable warnings

- uglify-js2 is now uglify-js
- shader code is now included for minification
- sourcemaps still does not work

- shaders are now encoded as a string
- works with node.js eg
-  node build.js --include common --include extras --output
   ../../build/three.js
-  node build.js --include common --include extras --minify --output
   ../../build/three.min.js

adopt common.glsl shader utilities across all shaders where applicable.  Fix vec*matrix bug in envmap_fragment.glsl

(three.js issue: #5552) add BinaryTextireLoader.js, RGBELoader.js (plus example), TGALoader.js extends BinaryTextureLoader.js

Also trying to only call gl.getExtension() when needed.

When I use this build tool, it occurs this error:

	D:\3rd_projects\three.js-master\utils\build>python build.py --include common --i
	nclude extras --output ../../build/three.js
	 * Building ../../build/three.js
	Traceback (most recent call last):
	  File "build.py", line 106, in <module>
	    main()
	  File "build.py", line 65, in main
	    tmp.write(f.read())
	UnicodeDecodeError: 'gbk' codec can't decode byte 0x92 in position 5904: illegal
	 multibyte sequence

It seems that the reason lies in the default encoding of the `open` function. On my computer it's `GBK` rather than `UTF8`. So I add the `encoding` parameter to it, and then it's just all right.