New example: demonstrate using PannerNode

[sole]

1. Create oscillator
2. Create PannerNode
3. Connect Oscillator to PannerNode, start it
4. Use setPosition method on PannerNode to demo initial position
5. Set AudioContext's AudioListener position
6. Create automation for oscillating the positionX, positionY, positionZ properties in the PannerNode without setting a JavaScript loop (orientationX, orientationY and orientationZ also available to automate)

[sole]

Would be nice to link to the demo in #5 for further explanation as it is the basis for automation