Handler for converting a KML string to GeoJSON

Testing instructions:

Copy the following block into the kmltogeojson's init function:

 var kmlString = require('fs').readFileSync('time-stamp-point.kml', 'utf8');
exports.convertKmlToGeoJSON(kmlString, function(err, resp){
        console.log(err);
        console.log(resp.features[0]);
    });

I can provide the kml above or you can use your own. It should spit out geojson to the console.