Adds Pako (an implementation of zlib deflate). Written by Boris Grozev.

index.html

     <script src="libs/rayo.js?v=1"></script>
     <script src="libs/tooltip.js?v=1"></script><!-- bootstrap tooltip lib -->
     <script src="libs/popover.js?v=1"></script><!-- bootstrap tooltip lib -->
+    <script src="libs/pako.bundle.js?v=1"></script><!-- zlib deflate -->
     <script src="interface_config.js?v=3"></script>
     <script src="libs/toastr.js?v=1"></script><!-- notifications lib -->
     <script src="muc.js?v=16"></script><!-- simple MUC library -->