Story #1776: Add mailer and update users_controller. Also, update workbench and setup script to pass the additional send notification parameter.
Story 1776: Add tests for setup email
Story 1776: Add theme to api server similar to workbench. Updated files: Gemfile, app/controllers/application_controller.rb, config/application.default.yml, config/routes.rb
Merge branch 'master' into 1776-setup-user-email
Merge branch 'master' into 1776-setup-user-email

Conflicts:
	services/api/app/controllers/arvados/v1/users_controller.rb
Merge branch 'master' into 1776-setup-user-email