Adds email notification on wiki changes (#413). It's disabled by default and can be enabled in application settings.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2749 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/mailer/wiki_content_updated.text.html.rhtml

@@ -0,0 +1,6 @@
+<p><%= l(:mail_body_wiki_content_updated, :page => link_to(h(@wiki_content.page.pretty_title), @wiki_content_url), 
+  	    														      :author => h(@wiki_content.author)) %><br />
+<em><%=h @wiki_content.comments %></em></p>
+
+<p><%= l(:label_view_diff) %>:<br />
+<%= link_to @wiki_diff_url, @wiki_diff_url %></p>