Fixes #72

Created by: kjacobsen16

• Adds endpoint to get stations within a bounding box, e.g. http://localhost:53812/stations/Bounds?xmin=-93.4662&xmax=-95.0990&ymin=45.8326&ymax=46.6428
• Allows geojson output for /stations, /stations/nearest and /stations/bounds endpoints, e.g. http://localhost:53812/stations/Bounds?xmin=-93.4662&xmax=-95.0990&ymin=45.8326&ymax=46.6428&geojson=true