This reverts commit 644d6a21.

Conflicts:
	src/materials/Material.js

This commit enables three.js to manage the stencil buffer via material
properties.

Actually use the loading manager in the CubeTextureLoader by passing it
to the internal ImageLoader.

LatheGeometry modified to use Vector2 and allowing axe choice by the
called.
The axe is designed by a letter because I didn't know where I should put
a constance definition.
The loop that create the geometry is not optimized for speed => the axis
test is in the inner loop.
Should not break any existing code.
Doc and exemple not updated yet.

LatheGeometry is a standard geometry but it's not processed by
parseGeometries of ObjectLoader.

Added property ignoreHTTPStatus. When set, the 'load' event handler will not check HTTP Status or readyState. Should only be used when XHRLoader fetch data from a non-http source (e.g. local file system, file://).

Fixes #7650

https://github.com/mrdoob/three.js/issues/7632
https://github.com/mrdoob/three.js/issues/7634

see http://stackoverflow.com/a/7375676/2207790

Make sure loadingmanager is aware of errors occured in 'load' event handler