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

app/controllers/issues_controller.rb

@@ -146,7 +146,6 @@ class IssuesController < ApplicationController
       if @issue.save
         attach_files(@issue, params[:attachments])
         flash[:notice] = l(:notice_successful_create)
-        Mailer.deliver_issue_add(@issue) if Setting.notified_events.include?('issue_added')
         call_hook(:controller_issues_new_after_save, { :params => params, :issue => @issue})
         redirect_to(params[:continue] ? { :action => 'new', :tracker_id => @issue.tracker } :
                                         { :action => 'show', :id => @issue })
@@ -193,7 +192,6 @@ class IssuesController < ApplicationController
         if !journal.new_record?
           # Only send notification if something was actually changed
           flash[:notice] = l(:notice_successful_update)
-          Mailer.deliver_issue_edit(journal) if Setting.notified_events.include?('issue_updated')
         end
         call_hook(:controller_issues_edit_after_save, { :params => params, :issue => @issue, :time_entry => @time_entry, :journal => journal})
         redirect_to(params[:back_to] || {:action => 'show', :id => @issue})
@@ -247,10 +245,7 @@ class IssuesController < ApplicationController
         issue.custom_field_values = custom_field_values if custom_field_values && !custom_field_values.empty?
         call_hook(:controller_issues_bulk_edit_before_save, { :params => params, :issue => issue })
         # Don't save any change to the issue if the user is not authorized to apply the requested status
-        if (status.nil? || (issue.status.new_status_allowed_to?(status, current_role, issue.tracker) && issue.status = status)) && issue.save
-          # Send notification for each issue (if changed)
-          Mailer.deliver_issue_edit(journal) if journal.details.any? && Setting.notified_events.include?('issue_updated')
-        else
+        unless (status.nil? || (issue.status.new_status_allowed_to?(status, current_role, issue.tracker) && issue.status = status)) && issue.save
           # Keep unsaved issue ids to display them in flash error
           unsaved_issue_ids << issue.id
         end