adding of BiddingAgentCluster; update adx protobuf to latest (Aug 22nd, 2013); updated exchange connector accordingly
do not start twice the cluster
following remi's comments
Merge branch 'new_MA' of https://github.com/jsulmont/rtbkit into jsulmont-new_MA
Removed the protobuf files from the .gitignore
fixed compile error
Merge branch 'master' into sched-exp