Fix failed to load plugin of jsk_rviz_plugins

* remove duplicated include lines of polygon_array_display.h
* add `<depend>` tag to manifest.xml of jsk_rviz_plugins. rviz expects the packages which provides plugins depend on rviz package.

see the original issue here https://github.com/jsk-ros-pkg/jsk_visualization/issues/9
and also it might affect the issue of this. https://github.com/jsk-ros-pkg/jsk_visualization/issues/5