Added best practices for general plugin development.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@9444 b35dd754-fafc-0310-a699-88a17e54d16e

documentation/docs/plugin-dev-guide.html

@@ -191,6 +191,15 @@ public class ExamplePlugin implements Plugin {
 </pre>
 </fieldset>
 
+<h3>General Plugin Best Practices</h3>
+
+<p>When choosing a package name for your plugin, we recommend that you choose
+something distinctive to you and/or your organization to help avoid conflicts
+as much as possible.  For example, if everyone went with org.example.PluginName,
+even if PluginName was different, you might start running into some conflicts
+here and there between class names.  This is especially true when working with
+clustering.</p>.
+
 <h2>Modifying the Admin Console</h2>
 
 <p>Plugins can add tabs, sections, and pages to the admin console. There