Add Support for Rudder 2.8, improve how we handle versions
Merge branch 'branches/rudder/2.4' into branches/rudder/2.6

Conflicts:
	provision/node.sh
	provision/node_centos5.sh
	provision/node_centos6.sh
	provision/node_sles11.sh
	provision/node_ubuntu.sh
	provision/server_centos6.sh
	provision/server_sles11.sh
	provision/server_ubuntu.sh