Add support for anchor / fragment by redirect.

Browser does not ship fragment to server. for this functionality you must use JavaScript like below.

Use as follows:
...
<script type="text/javascript">
	$(document).ready(function () {
		var anchor = location.href.split('#')[1];
		if (typeof anchor == "string"){
			$( "input:hidden#anchor" ).val(anchor);
		}
	})

</script>
<f:form package="My.Package" controller="Login" action="authenticate" name="authentication">
	<f:form.hidden id="anchor" name="__fragment" value=""/>
	<f:form.button name="casProviderName" value="MyCASProvider">Login</f:form.button>
</f:form>
...

"Fixes #2"