Note: If extras need to be included too:
python build.py --include webgl --include extras --minify --output ../build/three-webgl-extras.min.js

Note: If extras need to be included too:
python build.py --include webgl --include extras --minify --output ../build/three-webgl-extras.min.js

Simplified the code involving if( variable === undefined ) and fixed `String.prototype.trim` bug.

Correction in ColorUtils-a new color object is not returned, but the original object is modified in place instead.

Using the full THREE.LineStrip and THREE.LinePieces constants in the docs as it makes it more explicit and avoids guessing (is it a String? is it a constant?)

Is not exactly the same beaviour. object.traverse also applied the callback to object.
But I think it's better like this, because now we can do object.traverse( function ( node ) { node.visible = false } ) and it will also take care of the parent. However, if this creates any problem we can revert the behaviour.
I also prefer this behaviour because the code is simpler/cleaner :P

See discussion #2412

Renamed screen shader to blit.
Throwing errors in *Pass if the shader aren't available.