BUG Fixed a couple Rails 6 related issues with new account creation.

CHANGE Add more Google analytics for internal tracking of site usage.

CHANGE Changed the sending email address to no-reply@abstretta to make it less likely that emails get flagged as spam. The reply-to headers are right, so recipients will be able to reply to messages correctly.

CHANGE Removed Wisper for observer support, simplifying the callbacks to use native Rails.

BUG Fixed an issue with blank notification emails.