Updated builds.
Editor: WIP many fixes to be able to load exported scenes.

Not there yet completely, some things are still broken and code is pretty horrible but at least something starts to work.
Merge remote-tracking branch 'remotes/mrdoob/dev' into dev
Editor: Using color.getHexString()
Editor: Removed ambient color on object creation.
Ugh! And there I was thinking that UI.Color had a bug.
Added "AddOperation" environment mapping combine type for additive cube maps reflections / refractions.

Fixes #2559

We'll see, if this becomes a bottleneck in the fragment shader, all three environment mapping combine options could be changed from uniforms & ifs into #ifdefs.
Merge remote-tracking branch 'alteredq/dev' into dev
Editor: Reverting Menubar styling that was strangely opening when clicking on dropdowns and confirm()s.
Editor: fixed some oddities in fog UI behavior after importing scene.

Still fog color picker widget behaves weird: it doesn't display color selected by mouse after setting value from JS, yet value gets transmitted fine. Maybe it's a Chrome bug.
Editor: first steps towards light gizmos.

For the moment handling just changes via UI, not yet possible to drag gizmos.
Editor: Fixed behaviour for UI.Number.
Updated to tween.js r7.
Updated builds.
Added css3d panorama example.
CSS3DRenderer: Added backface visibility style.
CSS3DRenderer: Adding overflow hidden to main container (fixes iOS breakage).
Touch support to TrackballControls.
Trying to fix webgl_shading_physical example.

At least it works now, though GUI is still crazy.
More gui.dat change related fixes.

Just emergency fixes to make examples work. Still lot of things with GUI itself are broken :S
Added CSS3D Periodic Table example.