PR2/pr2_common — pull request #217 by danepowell (2013-07-23 19:57:25+00:00)
Title: Fixed attributes for grasp_check.

As of SDF 1.2, the properties of grasp_check should be defined as elements, not attributes ([reference](http://gazebosim.org/sdf/1.2.html#grasp_check)). This causes warnings and the attributes to be ignored in Gazebo 1.5, which uses SDF 1.3.