Orbit Camera Default

This replaces the trackball controls with orbit controls. A good example of the improvement is this:
In trackball mode (orig): click to look, and made a few circles in the center of the screen. Map will rotate upside down.
In Orbit mode: Map stays upright. Pan and zoom is more accurate.
Please someone review... I'm just a skiddie and don't have a deep understanding of threejs... I'm sure some parameters can be honed.