Updated npm package name.
Added install segment to README.
Update camera with initial values for translate and scale.
- Added panToElement, panToCenterOnRect, tweenToZoom, and translateX/YFromSel functions to support tweening to new zooms programmatically and to support panning to elements.
- Factored updateTransform out of syncZoomEventToTransform.
Updated README and example.html with panToElement usage. Version bump.