Mark Uptime as being added in 0.7.0.
Mark Host#uptime as being added in 0.7.0.
Mark RunStat as being added in 0.7.0.
Service#fingerprint was added in 0.7.0.
Removed the deprecated XML#runstats, since it was never released.
Renamed Uptime#lastboot to last_boot.
Updated the ChangeLog for 0.7.0.
Fixed a spec.
XML.open should cause @path to be set.