Release pr2_ethercat_drivers 1.8.1-0

Fixes deprecation warnings and compile warnings.
Merge pull request #1328 from ahendrix/patch-2

Release pr2_ethercat_drivers 1.8.1-0
prepare kobuki_soft release
correcting the url
Merge branch 'patch-1' of https://github.com/jihoonl/rosdistro into patch-1