amcl_demo.launch results in crazy spinning behavior

[pirobot]

This is right of the box on a new ROS Indigo install under Ubuntu 14.04. To reproduce run:

$ roscore
$ roslaunch turtlebot_gazebo turtlebot_world.launch
$ roslaunch turtlebot_gazebo amcl_demo.launch
$ roslaunch turtlebot_rviz_launchers view_navigation.launch

Now set a 2D Nav Goal in RViz and robot executes a spiral path toward goal.

[tfoote]

This looks like a duplicate of: turtlebot/turtlebot_apps#140

[pirobot]

Thanks Tully--looks like you are correct.