added annotation messages and cleaned up package maintainer lists.
adding rocon_annotation srvs.
Merge pull request #66 from robotics-in-concert/annotations

Annotation messages and cleaned up package maintainer lists.
Merge branch 'hydro-devel' of https://github.com/robotics-in-concert/rocon_msgs into hydro-devel
add a dummy msg to service_pair_msgs.
split id/data service pair messages and add a spec msg (like actionlib).
share specification being depracated now the demo is passed.
This reverts commit 8f0c5347374ed9993177bbfed5bfc389474534ad.