Add hints on using CDNs in docs and README

README.md

@@ -13,7 +13,7 @@ via [npm](https://github.com/npm/npm)
 
     $ npm install sinon
 
-or via sinon's browser builds available for download on the [homepage](http://sinonjs.org/releases/).
+or via sinon's browser builds available for download on the [homepage](http://sinonjs.org/releases/). There are also [NPM based CDNs]((http://sinonjs.org/releases#npm-cdns) one can use.
 
 ## Usage
 

docs/releases.html

@@ -11,6 +11,7 @@
 
 <div class="head-page">
   <h1>Releases</h1>
+  In addition to our download page, you can also <a href="#npm-cdns">use a NPM based CDN</a> for your convenience.
 </div>
 
 <div class="in-content releases">
@@ -32,3 +33,22 @@ <h1>Releases</h1>
   {% endfor %}
   </ul>
 </div>
+
+
+<div>
+    <h2 id="npm-cdns">Using NPM based CDNs</h2>
+    <p>
+    There are now several CDNs that are backed by NPM,
+    which means that you can have auto-updated scripts.
+    Examples of such free providers are
+    <a href="http://jsdelivr.com">jsDelivr</a>,
+    <a href="https://unpkg.com">UNPKG</a> and
+    <a href="https://cdnjs.com">cdnjs</a>.
+    </p>
+    <p>
+    Their adressing schemes vary, but an example
+    url such as <a href="https://cdn.jsdelivr.net/npm/sinon@3/pkg/sinon.js">https://cdn.jsdelivr.net/npm/sinon@3/pkg/sinon.js</a>
+    would download the latest browser bundle of Sinon 3.
+    </p>
+
+</div>