Added observers to watch model objects for mail delivery instead of calling Mailer.

* Added an IssueObserver to watch when Issues are created
* Added a JournalObserver to watch when Journals are created (Issue updates)
* Added a NewsObserver for News items.
* Added a DocumentObserver for Document notifications.
* Setup IssuesController#new to use the IssueObserver.
* Setup IssuesController#edit to use the IssueObserver.
* Setup IssuesController#bulk_edit to use the JournalObserver.
* Removed the Mailer call in Changeset#scan_commit_for_issue_ids, the
  JournalObserver will handle it.
* Removed Mailer calls in MailHandler in favor of the Observers.

  #2659

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2637 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/environment.rb

@@ -36,7 +36,7 @@ Rails::Initializer.run do |config|
   
   # Activate observers that should always be running
   # config.active_record.observers = :cacher, :garbage_collector
-  config.active_record.observers = :message_observer
+  config.active_record.observers = :message_observer, :issue_observer, :journal_observer, :news_observer, :document_observer
 
   # Make Active Record use UTC-base instead of local time
   # config.active_record.default_timezone = :utc