Add ol.geom.SimpleGeometry#getFirstCoordinate

src/ol/geom/simplegeometry.js

@@ -99,6 +99,14 @@ ol.geom.SimpleGeometry.prototype.getExtent = function(opt_extent) {
 };
 
 
+/**
+ * @return {ol.Coordinate} First coordinate.
+ */
+ol.geom.SimpleGeometry.prototype.getFirstCoordinate = function() {
+  return this.flatCoordinates.slice(0, this.stride);
+};
+
+
 /**
  * @return {Array.<number>} Flat coordinates.
  */