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/changeset_test.rb

@@ -24,6 +24,7 @@ class ChangesetTest < Test::Unit::TestCase
   end
   
   def test_ref_keywords_any
+    ActionMailer::Base.deliveries.clear
     Setting.commit_fix_status_id = IssueStatus.find(:first, :conditions => ["is_closed = ?", true]).id
     Setting.commit_fix_done_ratio = '90'
     Setting.commit_ref_keywords = '*'
@@ -38,6 +39,7 @@ class ChangesetTest < Test::Unit::TestCase
     fixed = Issue.find(1)
     assert fixed.closed?
     assert_equal 90, fixed.done_ratio
+    assert_equal 1, ActionMailer::Base.deliveries.size
   end
   
   def test_ref_keywords_any_line_start