Read GeoJSON from text file
Style data
Fade old data
Create popup
Edit existing data and add new data
Todo: edit properties of added data
Todo: style added data
Todo: read data from database
Todo: save changes back to the database
 Changes to be committed:
	modified:   css/winterbiking.css
	modified:   data/winterbiking.geojson
	modified:   data/winterbiking.js
	modified:   home.html
	modified:   js/featureFunctions.js