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>

examples/wmts-capabilities.js

@@ -1,5 +1,11 @@
 goog.require('ol.parser.ogc.WMTSCapabilities');
+goog.require('ol.projection.addCommonProjections');
 
+ol.projection.addCommonProjections();
+Proj4js.defs['EPSG:31256'] = '+proj=tmerc +lat_0=0 ' +
+    '+lon_0=16.33333333333333 +k=1 +x_0=0 +y_0=-5000000 +ellps=bessel ' +
+    '+towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 ' +
+    '+units=m +no_defs';
 var parser = new ol.parser.ogc.WMTSCapabilities(), result;
 var url = 'data/WMTSCapabilities.xml';