scheduler_msgs and rocon_std_msgs: backport from hydro-devel (#57)

These are new packages in the hydro branch, and should not
affect existing uses in that release.
reconcile package versions for upcoming 0.6.5 release (#57)
Merge pull request #58 from jack-oquin/hydro

scheduler_msgs and rocon_std_msgs: backport packages from hydro-devel