rocon_std_msgs centralises some app manager messages for sharing.
role manager messages, closes #24
Merge pull request #25 from robotics-in-concert/role_manager_stub

Role manager stub updates
adding service msg and srv
adding list rocon service
renaming rocon to concert. add enableservice
adding more service status.
updates
scheduler_msgs: add initial draft of new package
added a service name to uniquely separate same services in a solution.
CHANGELOG version bump(patch) 0.6.3
0.6.3
Add missing rocon_std_msgs package
api breaking version bump
Add concert service. enabling
scheduler_msgs: replace action and service definitions with ROS topic messages
Add a get platform info mimicking that on app manager messages.
Eventually the later should be replaced.
Remove nonexistent src directory from project description
scheduler_msgs: define request status similarly to actionlib goal states
scheduler_msgs: refine request status values