added a note about the required cron cartridge.
Remove old logic from oo-admin-upgrade
Admin script cleanup
Merge pull request #3252 from jwhonce/latest_cartridge_versions

Update cartridge versions for Sprint 31
Updating guide to with RHEL installation details
Merge pull request #3249 from kraman/docs

Updating guide to with RHEL installation details
Automatic commit of package [openshift-origin-cartridge-jbossews] release [0.7.5-1].
Automatic commit of package [openshift-origin-cartridge-10gen-mms-agent] release [1.26.4-1].
Automatic commit of package [openshift-origin-cartridge-cron] release [1.10.4-1].
Automatic commit of package [rubygem-openshift-origin-node] release [1.12.7-1].
Automatic commit of package [openshift-origin-cartridge-mysql] release [0.6.4-1].
Automatic commit of package [openshift-origin-cartridge-nodejs] release [1.13.5-1].
Automatic commit of package [openshift-origin-broker-util] release [1.12.7-1].
Automatic commit of package [openshift-origin-cartridge-postgresql] release [0.5.6-1].
Automatic commit of package [openshift-origin-cartridge-ruby] release [0.7.6-1].
Automatic commit of package [openshift-origin-cartridge-php] release [0.7.5-1].
Automatic commit of package [openshift-origin-cartridge-diy] release [0.7.5-1].
Automatic commit of package [openshift-origin-cartridge-perl] release [0.7.5-1].
Automatic commit of package [openshift-origin-cartridge-python] release [0.7.6-1].
Automatic commit of package [rubygem-openshift-origin-container-selinux] release [0.1.5-1].