Don't apply initialization params until after createdCallback() returns

Don't apply initialization params until after createdCallback() returns

This means that buildRendering() runs before any user the user defined parameters
are available.

This change is necessary to be forward compatible with browsers that implement
document.register() natively, because then programmatic creation (w/out
the syntactic sugar) will be:

var node = document.createElement("dui-slider");
node.max = 10;

Also remove runAfterRender().

With 0281a95 test_Button.html is running but StarRating and Slider are not.   We need to see if we can get them to work.