Added reset function to UnderwaterCamera to lock SimulateUnderwater() #61
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fixes #55
Reset bringing back the robot was fixed in a previous PR, however it would crash if not paused before resetting. This fix overrides the reset function in UnderwaterCamera and sets a locking variable in the dataPtr so that if gazebo reset while doing calculations for the SimulateUnderwater function, it will stop the function and return before a seg fault occurs.