Configuring Postgres 9.2 streaming replication with Redhat Clustering Suite for High Availability
repmgr is a nice place to go indeed. If you use pacemaker/corosync you shoud check this as well, its a Resource Agent handling repmgr : https://github.com/xmm/repmgr.
Pelase note you might need to either patch the provided Resource Agent or patch repmgr.