Added geometry lib script, and implemented collision prevention of nodes.
diff --git a/web/gui/src/main/webapp/index.html b/web/gui/src/main/webapp/index.html
index c2cb8f8..ebf25c5 100644
--- a/web/gui/src/main/webapp/index.html
+++ b/web/gui/src/main/webapp/index.html
@@ -14,6 +14,7 @@
     <link rel="stylesheet" href="base.css">
     <link rel="stylesheet" href="onos.css">
 
+    <script src="geometry.js"></script>
     <script src="onosui.js"></script>
 
 </head>