do not check position/limit error when lower limit and upper limit is same #726
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some robot has joint which upper limit and lower limit has same value, for example
https://raw.githubusercontent.com/start-jsk/rtmros_hironx/hydro-devel/hironx_ros_bridge/models/kawada-hironx.dae
and this outputs
https://travis-ci.org/start-jsk/rtmros_common/jobs/71699630
This PR skips limit check if ulimit and ulimit are same (actually if ulimit < llimit)