cvmfs_swissknife info now also checks for .cvmfs_master_replica presence
cvmfs_server checks the .cvmfs_master_replica sentinel before creating a new replication
Merge pull request #71 from reneme/check_replication_master

Check for .cvmfs_master_replica before creating a Stratum1 replication repository

cvmfs_server add-replica now checks for .cvmfs_master_replica before creating a Stratum1 replication. Before this issue was caught as well, but later in the process when invoking cvmfs_server snapshot.