BUG SilverStripeNavigator shows wrong message.

The message was always 'Published Site'.
Also there were no 'active' class on links.
Make message always visible at the top of the page

Make message always visible at the top of the page like the message in CMS preview iframe.
Make message always visible at the top of the page

Make message always visible at the top of the page like the message in CMS preview iframe.
Merge pull request #303 from uniun/patch-1

BUG SilverStripeNavigator shows wrong message.