[jsk_rqt_plugins] fix hist.py to work on kinetic

[knorth55]

this PR is improved PR of #688.
it works with matplotlib 1.5.1

[knorth55]

@iory can you check again with this PR?
I think the problem about matplotlib is solved.

[iory]

I also checked this PR and it works too!

[k-okada]

Good I’ll merge after Travis check Btw how did you clean the code , some plugin in vim? pep8 command ? I think we need to find editor independent way to check/fix the code style and each user customize their own editor C.f https://github.com/ros-planning/moveit_ci/blob/master/check_clang_format.sh#L15 And also if you wan to care about code style , we’d better to add to Travis check https://github.com/ros-planning/moveit/blob/kinetic-devel/.travis.yml#L18 2018年9月7日(金) 2:00 iory <notifications@github.com>:

***@***.**** approved this pull request. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#707 (review)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAeG3L6UDWo_0lf6tQkSb2iVG3_icPyDks5uYVSQgaJpZM4WdTHA> .

-- -- ◉ Kei Okada

[knorth55]

For python syntax check, I use flake8 + hacking ref: https://qiita.com/kitsuyui/items/5ab4608003a29ff7689f.
it uses openstack hacking guideline. https://docs.openstack.org/hacking/latest/
However, for normal users, roslint_python is enough.

[k-okada]

Please add them to the Travis CI, if you want to keep changing coding style for every PR,