Speed attribute (or more options as attributes)

[derhuebiii]

Would be nice to have an attribute to set the speed as an attribute. I have a polymate element inside a vaadin-dialog, so it gets moved out of the shadow dom and cannot be easily accessed via JS. So it would be helpful to do all this via the attributes.

e.g.
<polymate-view path="..." speed="0.3" repeat-x-times="3" ....>