Update demo scripts

Author: eligrey

demo/index.xhtml

@@ -49,9 +49,9 @@
             <input type="submit" value="Save"/>
         </form>
     </section>
-    <script async="" src="https://cdn.rawgit.com/eligrey/Blob.js/master/Blob.js"/>
-    <script async="" src="https://cdn.rawgit.com/eligrey/canvas-toBlob.js/master/canvas-toBlob.js"/>
-    <script async="" src="https://cdn.rawgit.com/eligrey/FileSaver.js/master/FileSaver.js"/>
-    <script async="" src="https://cdn.rawgit.com/eligrey/FileSaver.js/master/demo/demo.js"/>
+    <script async="" src="https://cdn.rawgit.com/eligrey/Blob.js/0cef2746414269b16834878a8abc52eb9d53e6bd/Blob.js"/>
+    <script async="" src="https://cdn.rawgit.com/eligrey/canvas-toBlob.js/8316fb3ee6d67f68f44089a82ab87bf580d2a5e3/canvas-toBlob.js"/>
+    <script async="" src="https://cdn.rawgit.com/eligrey/FileSaver.js/62d219a0fac54b94cd4f230e7bfc55aa3f8dcfa4/FileSaver.js"/>
+    <script async="" src="https://cdn.rawgit.com/eligrey/FileSaver.js/702cd2e820b680f88a0f299e33085c196806fc52/demo/demo.js"/>
 </body>
 </html>