support using nosetests with Python3
support using nosetests with Python3

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