MCO-532 update changelog and releasenotes for 2.7.0
Update heartbeat parameters to reflect MCO-522 changes
Update client reference to mention connection_timeout MCO-464
Update documentation of implemented_by to match MCO-466
Update the documentation to cover installing from lib layout MCOP-314
Merge pull request #269 from richardc/MCO-532-2.7.0_release_notes

MCO-532 2.7.0 release notes and documentation updates