Draw and edit markers, polylines and polygons on a Leaflet map (#30)
* Added leaflet draw functionality
* Added svg-inline-loader
* Updated example
* Updated package-lock
* Added proptypes. Linting
* Linting
* Remove copied asset files. Remove svg loader. Replaced if else with switch statement
* Updated package.lock
* Linting
* Added polygon edit functionality
* Added missing key in map layer item list
* linting
* Update Dash prop on saved edit of polygon
* Added proptype for polygonCoords
* Renamed function
* Use index instead of item name in React key
* Replaced switch with if statement. changed a variable scope from var to let.
* Replace switch statement with if statement
* Remove debug log message
* Remove debug log messages
