WL-3054 Make the mouse over on my active sites show the URL

Currently the mouseover just shows the name of the site, which we can
already see. To help users distinguish sites, for example with ambiguous
names, show them the URL of the site instead which contains information
such as the owning department / faculty.

Of course this is an interim measure until we can populate better info.
Merge pull request #5 from ox-it/WL-3054

WL-3054 Make the mouse over on my active sites show the URL