Plus added "onUpdate" callback handling also for cube textures.

This is necessary for OpenGL where pow(0,0) is undefined and apparently can be negative, leading to negative specular light (in DirectX you just get zero).

Also some more refactoring in IcosahedronGeometry and tweaks to geometries example.

Made by hand, trying to give more shininess to nose, forehead and lips, less to everything else.

Also refactored a bit regular Phong shader and refreshed Lee-Perry normal map example to be less zombie-like.

Except special cases like 3d renderers and cube cameras all examples should be now without warnings.

Updated Closure compiler. Added more verbose compile warnings. Fixed all compile warnings. Started to fix runtime warnings in examples.

For verbose compile warnings to be practical I had to add externs and disable some warnings manually (there were tons of complains about "global this" and "cannot instantiate non-constructor"). Other solution would be to annotate explicitly constructors all over the code base.

(prompted by John Carmack's praise of static code analysis http://altdevblogaday.com/2011/12/24/static-code-analysis/)

Made it toggleable with "renderer.autoScaleCubemaps" flag (on by default).

ATI OpenGL shader compiler doesn't seem to like texture access with UV coordinates generated in a loop.

Using boolean vector instead of "if ( expression && expression )".

This helps for hard shadows code path. There are still some problems with soft shadows code path, which still don't want to compile.

This exists also in Blender, useful for when you want to add shadows independent of lighting (it's cheaper to turn off SpotLight than to have it with 0 intensity).

Also modified a bit old skin shader - for some reason there was square root just after color * color.