added icons for new examples. minor tweaks (code styling)

index.html

@@ -268,6 +268,29 @@ The source code of the examples can be found in the
       <div>network info</div>
     </a>
   </div>
+  <div class="thumb">
+    <a href="examples/graph/18_fully_random_nodes_clustering.html">
+      <img src="img/gallery/graph/18_fully_random_nodes_clustering.png">
+      <div>network info</div>
+    </a>
+  </div>
+  <div class="thumb">
+    <a href="examples/graph/19_scale_free_graph_clustering.html">
+      <img src="img/gallery/graph/19_scale_free_graph_clustering.png">
+      <div>network info</div>
+    </a>
+  </div>
+  <div class="thumb">
+    <a href="examples/graph/20_navigation.html">
+      <img src="img/gallery/graph/20_navigation.png">
+      <div>network info</div>
+    </a>
+  </div><div class="thumb">
+    <a href="examples/graph/22_les_miserables.html">
+      <img src="img/gallery/graph/22_les_miserables.png">
+      <div>network info</div>
+    </a>
+  </div>
   <div class="thumb">
     <a href="examples/graph/graphviz/graphviz_gallery.html">
       <img src="img/gallery/graph/graphviz_gallery.png">

src/graph/Graph.js

@@ -40,11 +40,10 @@ function Graph (container, data, options) {
       image: undefined,
       widthMin: 16, // px
       widthMax: 64, // px
-      fixed:false,
+      fixed: false,
       fontColor: 'black',
       fontSize: 14, // px
       fontFace: 'verdana',
-//      fontFace: 'arial',
       color: {
           border: '#2B7CE9',
           background: '#97C2FC',