Minor cleanup in postprocessing glitch example

Minor cleanup in extrude splines example

Fixed loader md2 example

Fix for retina displays

Fix for retina displays (see #7272)

ObjectLoader continues to be broken with cached images

Fix for #7260: PointLight shadows work properly only if shadow is applied to first light added to the scene.

Quick docs fix for Matrix4.makeOrthographic.

Added call to _renderer.resetGLState() at the end of light loop in WebGLShadowMap.render(), updated WebGLRenderer.refreshUniformsShadow() to send inverse of point light position to shader. Fixes #7260.