Update publisher queue_size to avoid warning in indigo.

[stonier]

They just implemented the warning to encourage rospy publishers to specify a queue_size in indigo.

• http://lists.ros.org/pipermail/ros-users/2014-March/068333.html
• http://wiki.ros.org/rospy/Overview/Publishers%20and%20Subscribers

It's very spammy :neckbeard:

[bit-pirate]

Looks good.