Fix tests.

wise-webapp/src/main/java/com/wisemapping/model/MindmapIcon.java

@@ -18,7 +18,7 @@
 
 package com.wisemapping.model;
 
-public class MindmapIcon {
+public class MindmapIcon implements Comparable{
     private String name;
     private IconFamily family;
 
@@ -38,4 +38,8 @@ public class MindmapIcon {
     public String getId() {
         return family.name().toLowerCase() + "_" + name;
     }
+
+    public int compareTo(Object o) {
+        return ((MindmapIcon)o).getId().compareTo(this.getId());
+    }
 }