Added New Layers

* MSA Labels now default label selector (over counties)
* Three new layers added to category drop-down
* New bubble style and layerType functions to detect draw properties inserted into Map.JS (layerType param now passed to draw and redraw functions)
* Additional code to detect which key images should be displayed updated on map
* LayerType calculation broken out into its own function for use both inside and outside layerUpdate function
* Minimap inset added to main map page