Merge some deleted comments back in from master

Author: prushforth

map-styles.html

@@ -2,6 +2,8 @@
 <dom-module id="map-styles">
   <template>
     <style>
+/* required styles  copied from leaflet.css and mapml.css for use in web-map and related
+   custom elements */
 /* this is required by tiles which are actually divs with multiple images in them */
 .leaflet-tile img {
 	position: absolute;