Bug 899222 - Make about:home work via message passing (r=felipe).

--HG--
rename : browser/modules/AboutHomeUtils.jsm => browser/modules/AboutHome.jsm
bug 893180 - [WebGL 2.0] gl.vertexAttribDivisor (GL_ARB_instanced_array) - r=jgilbert
Bug 898926 - xbl:children elements are insertion points if they're inactive. r=sicking
Bug 898926 - Add reftest. r=sicking
Bug 866569 - Unlink nsXULPrototypeNodes more aggressively. r=smaug