Integrate googlanalytics into site nav

[sebbacon]

There's a stats plugin (e.g. at ​http://trac.ckan.org/ticket/832).

Output from the googleanalytics plugin should append to that page, if the stats plugin is present.

Possibly the stats plugin and the googleanalytics plugin should be merged?

Finally, if the stats plugin is active, then a link to the stats page should be added to the main site footer.

[dread]

Stats already in site nav - adjusting title to just mention google analytics.