Rotating images with two fingers

[mehdi-cit]

Hello all and thank you for this nice library.
I am using it on a large touch screen to let user rotate images around. Intuitively, the users try to rotate the picture with multiple fingers (the screen being rather large). However, this does not work. If one uses more than a single finger it tries to sclae/zoom the picture with no rotation happening. I tried to disable zooming viewer.controls().disableMethod('pinch'); which by itself doesn't make rotating the pciture with multiple fingers possible.
Is there a way to do it at all?
Thank you in advance for your assistance.
PS: I tried the demo https://www.marzipano.net/demos/touch-gestures/ found on https://www.marzipano.net/demos.html
But it doesn't rotate the picture on multi finger swiping!

[tjgq]

Dragging or rotating with two fingers isn't currently supported, sorry. We'd welcome a PR implementing it.

[mehdi-cit]

Here's a PR
#390