Add example with simple permalink support

This PR is still work in progress. For some reason the panning does not work (mouse cursor is always "finger" when the map is loaded)!?
Since this example is an evolution of the "map-extension" example, it might also be transfered in it.
> In geoadmin3 we decided against using Angular's $location and the HTML5 mode.

By the way I read that the HTML5 mode in $location falls back to the hashbang mode for browsers that do not support it (IE9 and 10?). Is your location service supported by such browsers?