show overlay menu when switching jsk teleop joy plugins

When you press "select" button, you can see a menu like follows by using OverlayMenu rviz plugin
defined in jsk_rviz_plugins

![screenshot_from_2014-06-19 12 25 39](https://cloud.githubusercontent.com/assets/40454/3323404/804ffd30-f761-11e3-8434-07739f2001e3.png)