added action mailer to production
added SENDGRID variables to chamber
added smtp sendgrid settings to environment.rb
added RegistrationsController
generated UserMailer
deleted registrations spec and modified UserMailer spec
updated registrations controller
added registrations controller overide in routes.rb
added delayed job to gemfile and database
updated UserMailer
add UserMailer view
fixed extra . in welcome.html.erb
Merge branch 'master' into tdd