added download_test_data
added download_test_data

beni55/catkin,wkentaro/catkin,shyamalschandra/catkin,jack-oquin/catkin,wkentaro/catkin,shyamalschandra/catkin,meyerj/catkin,scpeters/catkin,thaddeustaylor/catkin,asmodehn/catkin,wkentaro/catkin,ros/catkin,scpeters/catkin,asmodehn/catkin,meyerj/catkin,harmishhk/catkin,harmishhk/catkin,scpeters/catkin,harmishhk/catkin,beni55/catkin,asmodehn/catkin,ros/catkin,thaddeustaylor/catkin,jack-oquin/catkin,thaddeustaylor/catkin,meyerj/catkin,beni55/catkin,jack-oquin/catkin,shyamalschandra/catkin,ros/catkin