ReflexUSBHand consturctor breaks global/relative namespace scoping

[OAkyildiz]

in reflex/src/reflex/reflex_usb_hand.py

'class ReflexUSBHand(ReflexHand):
    def __init__(self):
        self.usb_hand_type = rospy.get_param('usb_hand_type')  
        self.init_namespace = '/' + self.usb_hand_type

sets the namespace to hand type as opposed to __init__(self, name): in the older 'reflex_sf_hand.py' where it would set the anem to given launch arg.

This version predefines the namespace as the type and still uses it for functionality defined by type, thus limiting the configuration options. Also, the preceding slash forces looking into root instead of a given namespace. Most critically, the node looks at /<< handtype >> for params instead of the user-given name of the hand.

[OAkyildiz]

Addressed here: #33