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/unit/document_test.rb

@@ -25,6 +25,15 @@ class DocumentTest < Test::Unit::TestCase
     assert doc.save
   end
   
+  def test_create_should_send_email_notification
+    ActionMailer::Base.deliveries.clear
+    Setting.notified_events << 'document_added'
+    doc = Document.new(:project => Project.find(1), :title => 'New document', :category => Enumeration.find_by_name('User documentation'))
+
+    assert doc.save
+    assert_equal 1, ActionMailer::Base.deliveries.size
+  end
+
   def test_create_with_default_category
     # Sets a default category
     e = Enumeration.find_by_name('Technical documentation')