added rails_12factor in gemfile for heroku deployment.
added ruby version 2.0.0 to gemfile
added MongoHQ in config/mogoid file
set secret token in heroku config and changed secret_token.rb to incorporate this token.
changed mongoid.yml for heroku
changed find_by to find_or_create_by
find_by only
added raise_not_found_error: false in production