BricLayer support for demo NeffBarAnim.html (story 875)

@lbondaryk, @seannives and @ysahnpark this branch is ready for code review.

It should implement story 875 which was to create config and update the BricLayer to handle that config for the brix in the demo file NeffBarAnim.html.

The story did not include the mortar or the config for the mortar needed for that demo file.

Because of that, once the BricLayer has created (and rendered) the brix for the demo file, I've added inline functionality to accomplish what the mortar will eventually do.

Mike