* add sidekiq web view if the user is an administrator
* add sidekiq setup configuration and support
* update devise to use delivery_later method and update test
* update conversation to use deliver_later instead of deliver
* Update Routes
* Add Procfile for Heroku One-Click Start
* updating docs
* update concurrency and Procfile for supporting Heroku Free Dyno
* update Procfile.dev
* Add `invited_by` foreign key to User
Allows for a User to be tied to the user who invited them
* Include `current_user` in new agent initialization parameters
* Add `shoulda-matchers` for testing associations
* Add Inviter information and associated account to welcome email
* Only show inviter info if applicable
* Update conversation spec for FFaker compatibility