fix error in gazebo simulation log
see http://answers.ros.org/question/186681/no-valid-hardware-interface-element-found-in-joint/?answer=187192#post-id-187192
Merge pull request #15 from robomakery/feature/fix-gripper-finger-controller-name

Updating name of gripper controller
Merge pull request #16 from robomakery/feature/fix-gazebo-error-in-clam-urdf

fix error in gazebo simulation log
Merge remote-tracking branch 'upstream/indigo-devel' into indigo-devel