Cleaning some bundle bugs which confused Jenkins
Adding fastercsv gem
Use csv_pirate instead of fastercsv
Enable /activities.csv and /activities/all_activities.csv

For [#44414205]. This gem is handy but uses method names which lead to opaque code.
Enables user export through /admin/users.csv

This is the rest of [#44414205], with a user table including total activity count and public activity count.
Merge branch 'master' into staging