Remove haml ref from twilio_controller.
Merge branch 'master' of github.com:TwilioDevEd/clicktocall-rails

* 'master' of github.com:TwilioDevEd/clicktocall-rails:
  Turned instance variables into class variables.
  remove haml require
  remove haml from gemfile lock
  landing page
  adding landing page, fixing erb template