Commits
Uwe L. Korn authored and Wes McKinney committed 8520061d38c
ARROW-336: Run Apache Rat in Travis builds @julienledem Integrated the rat call in the cpp build. It should fail if licenses are not matching. We could also make a separate `lint` Travis build but for the moment this seemed overkill to me. Author: Uwe L. Korn <uwelk@xhochy.com> Closes #174 from xhochy/ARROW-336 and squashes the following commits: 25f797c [Uwe L. Korn] Make run-rat executable 6b6221f [Uwe L. Korn] ARROW-336: Run Apache Rat in Travis builds