concert transitions now working for conductor v2.
don't go hunting for the gateway, configure it instead.
concert client publishers reintegrated in for the new conductor
client status/gateway-info update handling and alot of minor fixes.
bugfixes to reenable chatter concert.
eliminate redundant rapp_status and use uri's properly.
ConcertClientException no longer useed.
Updated Idle->Available to reflect state name refactoring and relevant
comments.

Dummy transition handler for wireless dropouts.
expose gateway_unavailable_timeout as an arg
small documentation on how the state machine works.
wireless handling and not using gone clients to generate concert aliases.
sphinx docs for concert conductor
compatibility tree scheduler now tolerates missing clients.
replace string constant with string...this should eventually depracate anyway.
unregister the gateway info subscriber after we've finished with it.
remove unused conductor process pulls once they're done with, #222
Merge branch 'indigo' of https://github.com/robotics-in-concert/rocon_concert into indigo
bugfix accidentally cancelled publisher pulls with the service pulls, #222
bifurcating shell/gui processing for concert_conductor_graph
remove debugging print.