Issue #57: Add documentation for host and mbean history request usage.
Issue #57: Add documentation for host and mbean history request usage.

mk23/jmxproxy,mk23/jmxproxy,mk23/jmxproxy,mk23/jmxproxy,mk23/jmxproxy,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy