- Remove meta pkg; ar_track_alvar is 'unary stack' so no need for the meta pkg.
- Contributors: Scott Niekum, Isaac IY Saito
- move README to root directory
- Merge remote-tracking branch 'origin/hydro-devel' into indigo-devel
- ar_track_alvar package uses ar_track_alvar_msgs
- restructuring packages. Separate out the message package.
- Contributors: Jihoon Lee