make sure we can implement continue with more flexibility

[christophe-g]

• Continue fires and event (paper-stepper-continue). This allow to implement one's own logic inside paper-step and have other elements fireing the same event (and triggering the stepper to continue)
• Continue button can be hidden with hideContinueButton set to true

[Zecat]

Thanks, I like the idea of relying on custom controls but in this case, instead of just hiding the continue button, the full #buttonsWrapper of paper-stepper should be display: none; so the "buttons block" is no longer part of the layout, maybe with a no-button attribute.

In consequence, the slideshow viewport of paper-step should be resized when no-button changes and in paper-step, _updateSlideshowViewportTop should be updated to manage this.$$('#slideshowViewport').style.bottom which is for now hard coded to 84px (the clientHeight of #buttonsWrapper).

This is just for the horizontal layout, the vertical one should also be managed.

[christophe-g]

Yes, that makes more sense and is a bit more elegant.
Then in this case, we would also need to implement a paper-stepper-back and paper-stepper-progress event so as to be able to cover those cases with custom control as well.
What do you think ?

[christophe-g]

Implemented via no-button attribute.
We now have paper-stepper-back and paper-stepper-progress events (in addition to paper-stepper-continue)