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