Removed duplicate rel in line 8 (#108)

Author: amitse

index.html

@@ -5,7 +5,7 @@
 
         <link href="logo/UI_Shield.png" rel="shortcut icon">
 
-        <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.css" rel="stylesheet">
+        <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.css">
         <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">
         <link href="css/app.css" rel="stylesheet">
     </head>