Update ntp time plugin to use ntpdate

This leaves the heavy-lifting for the native package and removes the
dependency on the ruby gem
Include "steal" in CPU usage

Help virtualized systems track how much time was stolen
Merge pull request #99 from eric/use-ntpdate

Update ntp time plugin to use ntpdate
forcing english for parsing
Merge branch 'master' of github.com:scoutapp/scout-plugins
Merge pull request #100 from eric/include-steal-in-cpu-usage

Include "steal" in CPU usage
using all caps for LANG
Just reporting steal and not guest metrics, updating tests, cleaning up metadata