Zoom directive loaded into index.html via a Zoom module
Able to detect wheel up or down for zoom in or out
Moved zoom function from zoom_module.js to naviagtion_directive
Zoom and pan working together. Todo: zoom to mouse position
Improved addNoteDirective to add coordinate to correct add/zoom
Working on getting zoom to focus on center or mouse location
Working on zoom and draggable
Added navigationService to draggable.js to scale distances after a zoom is applied
Still working on zoom to center of screen