Add gems required for Google Analytics API access.
Alphabetize Gemfile additions for legato.
Ticket #85: Skeleton for public usage statistics page.
Ticket #85: Add configuration setting for Google API service account email.
Ticket #85: show total visits and time on site by intervals, from GA.
Ticket #85: Query GA via GoogleAnalytics.results (works more consistently)
Gemfile.lock as ordered by bundler