Added config and logic (and demos) for aspectRatio (scale parameter).

Hi

I looked into the responsivity-logic and maybe I one day will complete it. But there are really a lot to consider so I think I will discuss it first…

But anyhow I implemented a small feature aspectRatio that for now covers our, Mobytechs and mine, needs and completes the expand-option so that the scaling is kept to a constant factor (the aspectRatio).

Hope you can see the benefit with it. And feel free to change the examples…