Added Ruby 2.1.0 to travis and fixed rbx-d19

As by this issue: travis-ci/travis-ci#1641
rbx-d19 is not recommended (and does not work anymore)

.travis.yml

@@ -5,13 +5,13 @@ rvm:
   - 2.0.0
   - 1.9.3
   - 2.1.2
-  - rbx-19mode
+  - rbx-2
   - ruby-head
 services: mongodb
 #script: ./script/rspec-queue-mongoid.rb --format progress spec
 matrix:
   allow_failures:
-    - rvm: rbx-19mode
+    - rvm: rbx-2
     - rvm: ruby-head
 
 

app/mailers/mailer.rb

@@ -52,7 +52,7 @@ def comment_notification(comment)
 
     errbit_headers 'App' => @app.name,
                    'Environment' => @notice.environment_name,
-                   'Problem-Id' => @problem.problem_id,
+                   'Problem-Id' => @problem.id,
                    'Comment-Author' => @user.name
 
     mail :to      => recipients,