Access to metrics data for Cookbook authors

[brian-rose]

Authors of individual cookbooks currently have no way of accessing any usage metrics of their content. These metrics are always helpful when reporting back to funders, employers, etc.

We are currently using google analytics to gather usage metrics for everything hosted on projectpythia.org. Some limited metrics are publicly displayed on our custom metrics page, but there is no way for individual authors who don't have access to the analytics data to see the specific numbers for their pages.

Access to metrics data should be automated somehow, perhaps at time of "publication" on the Pythia gallery.