Add OSM source service (#224)

Also: update logo pointer to new openHAB logo

Signed-off-by: Henning Treu <henning.treu@telekom.de>

bundles/org.openhab.ui.paperui/patch/web/js/extensions.js

@@ -0,0 +1,16 @@
+/* This file can be be overridden by fragments to include custom JS code */
+angular.module('PaperUI.extensions', []) //
+
+.service('mapSourceService', function() {
+    var OSMSource = new ol.source.OSM({
+        tileLoadFunction : function(tile, src) {
+            tile.getImage().src = src + "?openhab";
+        }
+    });
+
+    return {
+        getMapSource : function() {
+            return OSMSource;
+        }
+    };
+})