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

test/functional/news_controller_test.rb

@@ -112,6 +112,9 @@ class NewsControllerTest < Test::Unit::TestCase
   end
   
   def test_post_new
+    ActionMailer::Base.deliveries.clear
+    Setting.notified_events << 'news_added'
+
     @request.session[:user_id] = 2
     post :new, :project_id => 1, :news => { :title => 'NewsControllerTest',
                                             :description => 'This is the description',
@@ -123,6 +126,7 @@ class NewsControllerTest < Test::Unit::TestCase
     assert_equal 'This is the description', news.description
     assert_equal User.find(2), news.author
     assert_equal Project.find(1), news.project
+    assert_equal 1, ActionMailer::Base.deliveries.size
   end
   
   def test_edit_routing