find test codes in irteus/test directory to reduce description in .travis.yml according to the discussion in https://github.com/euslisp/jskeus/commit/83432a3d75c950481e9f3079b077f47f73c1059dp ;; currently unittest.l is neglected because it does not work
Merge pull request #88 from snozawa/reduce_travis_description

Travis passed. Merged.
I'll remove unittest.l neglecting after [2] and [3].