Added links to cdnjs in downloads section

index.html

@@ -209,12 +209,19 @@
                         as part of <a href="http://chap.almende.com/" target="_blank">CHAP</a>.
                         Vis.js runs fine on Chrome, Firefox, Opera, Safari, IE9+, and most mobile browsers (with full touch support).
                         This site contains documentation, downloads and live examples of vis.js. The <a href="https://github.com/almende/vis/issues">sourcecode of vis.js</a> is available at Github. For questions, issues, and suggestions please use the <a href="https://github.com/almende/vis/issues">issues section</a> of the Github project.
-                    <h3>installing with npm</h3>
+                    </p>
+                    <h3>install with npm</h3>
                     <pre class="prettyprint">npm install vis</pre>
-                    <h3>installing with bower</h3>
+                    <h3>install with bower</h3>
                     <pre class="prettyprint">bower install vis</pre>
+                    <h3>link from cdnjs.com</h3>
+                    <p>
+                        <a href="https://cdnjs.cloudflare.com/ajax/libs/vis/3.10.0/vis.min.js" target="_blank">vis.min.js</a><br>
+                        <a href="https://cdnjs.cloudflare.com/ajax/libs/vis/3.10.0/vis.min.css" target="_blank">vis.min.css</a>
+                    </p>
                     <h3>download</h3>
-                    <a href="download/vis.zip">vis.zip (version <span class="version">3.10.0</span>)</a>
+                    <p>
+                        <a href="download/vis.zip">vis.zip (version <span class="version">3.10.0</span>)</a>
                     </p>
                 </div>
             </div>