install nodelet xml

Otherwise libuvc_camera produces a (non-fatal) error
on each startup and the nodelet can't be found.

libuvc_camera/CMakeLists.txt

@@ -40,3 +40,7 @@ install(TARGETS camera_node libuvc_camera_nodelet
   LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
   RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
   )
+
+install(FILES libuvc_camera_nodelet.xml
+  DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
+  )