(rtmlaunch) Add usage api doc

[130s]

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[130s]

travis passed

[k-okada]

It seems our use case becomes clearer

1. people want write document in github code (index.rst)
2. people want write document in each package ( Add README for hrpsys_ros_bridge and euslisp usage #470)
3. people want to read document from roswiki

if we can directory convert readme.rst to wiki page, that's great, but seems difficult. So possible solutions are

1. using doc_lite to convert (index.rst, or Add README for hrpsys_ros_bridge and euslisp usage #470) can be appear somwhere in http://docs.ros.org/hydro/api/hironx_tutorial/html/ (Add document and its setting using rosdoc_lite tork-a/hironx_tutorial#2 (comment))
2. Check http://bloom.readthedocs.org/en/0.5.7/ if it convert readme.rst for each packages to the web page.