[fixed] Auto rotate and missing delay option

[micheus]

Hank, thanks for report that. Just a week ago I noticed that changing the Angle parameter has no effect in the rotation.

The tip by tkbd should be working (increase/decrease during rotation).

Delay option abolished after that,but I don't know why.

I'm going to share a answer I got from dgud

The old implementation was broken and could stall the whole machine if the model was
to large or used +/- to change the speed, so I changed it.
Now you don't change the speed, you change the rotation..
But it requires that erlang can draw the model in 60FPS, if it can't it will take longer time.