Add support for OSM vector tiles

examples/osm-vector-tiles.html

@@ -0,0 +1,9 @@
+---
+layout: example.html
+title: OSM Vector Tiles
+shortdesc: Using OpenStreetMap vector tiles.
+docs: >
+  A simple vector tiles map with OpenStreetMap vector tiles. **Note**: The tiles used in this example are not optimized for rendering - they clip tiles exactly at the tile boundary instead of adding a buffer, and use geographic coordinates instead of tile relative pixel coordinates in view projection.
+tags: "vector, tiles, osm"
+---
+<div id="map" class="map"></div>