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/documents_controller_test.rb

@@ -66,6 +66,8 @@ class DocumentsControllerTest < Test::Unit::TestCase
   end
   
   def test_new_with_one_attachment
+    ActionMailer::Base.deliveries.clear
+    Setting.notified_events << 'document_added'
     @request.session[:user_id] = 2
     set_tmp_attachments_directory
     
@@ -82,6 +84,7 @@ class DocumentsControllerTest < Test::Unit::TestCase
     assert_equal Enumeration.find(2), document.category
     assert_equal 1, document.attachments.size
     assert_equal 'testfile.txt', document.attachments.first.filename
+    assert_equal 1, ActionMailer::Base.deliveries.size
   end
   
   def test_edit_routing