Add the erd.pdf file to the ignore list
Add rails-erd to the Gemfile
Create a custom has_errors_on RSpec matcher
Introduce SpeakerProfile

All the personal data of the user that is not used for system
tasks (such as login) is held here.
Specify default ActionMailer host for dev and test
Add Mobile Phone validation to SpeakerProfile
Add more validations to SpeakerProfile