Updated version to 0.5.0-rc.2
Merge pull request #730 from aledsage/feature/MembershipTrackingPolicy-sensors-0.5

MembershipTrackingPolicy: support configuring sensors to track
Merge pull request #732 from grkvlt/0.5.0-rc.2

Updated version to 0.5.0-rc.2
Updated use of BROOKLYN_VERSION tags