Merge pull request #104 from ipa-fxm/indigo_dev

catkin_lint'ing
fix buildfarm errors
update changelog
0.5.6
Merge pull request #105 from ipa320/indigo_release_candidate

Indigo release candidate
Merge branch 'indigo_dev' of github.com:ipa-fxm/schunk_modular_robotics into velocity_interface_controller_indigo