Add sample arm robot which we can configure links and joints parameters.
Merge pull request #75 from snozawa/add_multidof_sample_arm_robot

Travis passed and separation of file has been completed. 
https://github.com/euslisp/jskeus/pull/73
Merged.
Merge branch 'master' into snozawa-master
reduce sensor accessor specification ;; only string-name and keyword-name are supported