Use protocol-relative URL for html5shim in examples
Created by: cvrebert
The included examples currently load the shim using:
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
The URL should instead be protocol-relative so that the examples are copy-paste-ready-to-go for HTTPS sites, like in the shim's own example:
<script src="//html5shim.googlecode.com/svn/trunk/html5.js"></script>