Added a set of options to moon.Panels.pushPanels() to make it more convenient

### New Options
* setIndex: automatically switch to any panel after creation.
* transition: default true, ability to disable the transition, and jump immediately to the new panel index.

_Existing functionality is unaltered._
Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>