Update examples/css3d_periodictable.html

Removed duplicate initialization of object variables. 
The original table-item-object isn't actually used in the
loops.

Merge remote-tracking branch 'maxogden/pointerlock-bugfix' into dev

Update examples/webgl_custom_attributes_particles3.html

The result for attributes.size.value[i] can be negative which in turn makes gl_PointSize negative. As an example if Math.sin(...) returns -1 then you'll get -6 as a result. The specification specifically states:"If the value written to gl_PointSize
is less than or equal to zero, results are undefined". In fact it is causing such a problem on our platform.
 

Docs: Removed controls.

Updated README and removed unneeded includes in example.

Tweaked the cloth simulation example a little.

Fixed SceneUtils.cloneObject.

Updated r46 with some bugfixes found post release.