segfault on gripper detach

Issue #61 resolved
Deanna Hood created an issue

The issue was originally reported as spurious segfaults upon gripper control, but the user is unable to reproduce it reliably.

I suspect it is a situation similar to http://answers.gazebosim.org/question/12118/intermittent-segmentation-fault-possibly-by-custom-worldplugin-attaching-and-detaching-child/ or https://bitbucket.org/osrf/gazebo/issues/2034/flaky-seg-fault-when-detaching