Exporting KML parser options

This is necessary because application developers need to be able
to configure the KML parser.

src/objectliterals.jsdoc

@@ -223,6 +223,18 @@
  * @property {boolean|undefined} visible Visibility. Default is true (visible).
  */
 
+/**
+ * @typedef {Object} ol.parser.KMLOptions
+ * @property {boolean|undefined} extractAttributes Should we extract attributes
+ *     from the KML? Default is `true´.
+ * @property {boolean|undefined} extractStyles Should we extract styles from the
+ *     KML? Default is `false`.
+ * @property {number|undefined} dimension Create geometries with `dimension`
+ *     dimensions. Default is 3.
+ * @property {number|undefined} maxDepth Maximum depth to follow network links.
+ *     Default is 0, which means we don't follow network links at all. 
+ */
+
 /**
  * @typedef {Object} ol.source.BingMapsOptions
  * @property {string|undefined} culture Culture.