2.9.3 - Optimizations pass

Changed

• Changed many of the queries around multi-table user content to optimize on number of requests to the database, reducing queries by 12x in many places
• Fixed an issue that could show incorrect names on content in rare cases on the Recent Activity page
• Improved code readability

Fixed

• Fixed an issue that would sometimes show an error page after successfully adding a card on file, without specifying a plan to change to
• Fixed a potential bug that showed a 500 when generating a writing prompt for a universe
• Fixed the styling and clickability of checkboxes on login and around the site (thanks @euank)
• Fixed a bug that could show a 500 on the dashboard after successfully deleting a page

Added

• Added Barnes for Ruby language metrics & reporting
• Added a generic ContentPage model for polymorphically grouping content pages in a single AR relation

Removed

• Removed Raygun
• Removed some dead/outdated code