Update .travis.yml
kobuki_driver : Updated doxygen script to let user do something when authentification of repository is failed.
kobuki_driver : Updated protocol specification in doxygen about custom PID gain setting. Issue #249.
kobuki : Removed .travis.yml file.
Merge pull request #293 from yhju/hydro-devel

Updated doxygen script and firmware specification about custom pid gain setting. Issue #249.