Add experimental examples

examples/filter-points-webgl.html

@@ -13,6 +13,7 @@ docs: >
     to store the year of impact.
 
 tags: "webgl, icon, sprite, filter, feature"
+experimental: true
 ---
 <div id="map" class="map"></div>
 <form>

examples/geographic.html

@@ -7,6 +7,7 @@ docs: >
   makes it so the map view uses geographic coordinates (even if the view projection is
   not geographic).
 tags: "geographic"
+experimental: true
 resources:
   - https://code.jquery.com/jquery-2.2.3.min.js
   - https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css

examples/icon-sprite-webgl.html

@@ -13,6 +13,7 @@ docs: >
 
   The dataset contains around 80k points and can be found here: https://www.kaggle.com/NUFORC/ufo-sightings
 tags: "webgl, icon, sprite, point, ufo"
+experimental: true
 cloak:
   - key: pk.eyJ1IjoidHNjaGF1YiIsImEiOiJjaW5zYW5lNHkxMTNmdWttM3JyOHZtMmNtIn0.CDIBD8H-G2Gf-cPkIuWtRg
     value: Your Mapbox access token from https://mapbox.com/ here

examples/mapbox-layer.html

@@ -5,6 +5,7 @@ shortdesc: Example of a Mapbox-gl-js layer integration.
 docs: >
   Show how to add a mapbox-gl-js layer in an openlayers map. **Note**: Make sure to get your own API key at https://www.maptiler.com/cloud/ when using this example. No map will be visible when the API key has expired.
 tags: "simple, mapbox, vector, tiles, maptiler"
+experimental: true
 resources:
   - https://unpkg.com/mapbox-gl@0.54.0/dist/mapbox-gl.js
   - https://unpkg.com/mapbox-gl@0.54.0/dist/mapbox-gl.css