Fix wmts-capabilities example

the parsing of the wmts getCapabilities document require proj4js.

Also initialize common ol3 projections with ol.projection.addCommonProjections
so that it won't try to get EPSG:3857 from proj4js.

examples/wmts-capabilities.html

@@ -44,6 +44,7 @@
 
     </div>
 
+    <script src="http://cdnjs.cloudflare.com/ajax/libs/proj4js/1.1.0/proj4js-compressed.js" type="text/javascript"></script>
     <script src="loader.js?id=wmts-capabilities" type="text/javascript"></script>
 
   </body>