update changelog
"0.5.1"
"0.5.2"
Merge pull request #75 from ipa-fxm/hydro_dev

remove file
added missing install tag
catkin_lint cleanup
Merge pull request #76 from abubeck/hydro_dev

Cleanups for hydro release
Merge branch 'hydro_dev' into hydro_release_candidate
Merge pull request #78 from ipa320/hydro_release_candidate

Hydro release candidate