NMS-6678: Initial revision of OpenManageChassisMonitor's documentation

Please make sure that the monitor is really distributable.

http://issues.opennms.org/browse/NMS-6678

Cyrille
NMS-6678: Recommended layout changes + added info where to download Dell MIBs + added a node about the SNMP configuration preriquisite.

Cyrille
Solved conflict including the OpenManageChassisMonitor
Merge branch 'StCyr-cyr-doc-OpenManageChassisMonitor' into development/docs
Merge pull request #66 from indigo423/development/docs

NMS-6678: Merging OpenManageChassisMonitor into docs