Logging events to the Windows Event Log

I'm unsure about introducing a new base class here, would love some comments there.
Paging @btm @randomcamel @adamedx @opscode/client-engineers 
This is a fair point. Its fairly easy to do on windows as we don't need ohai to tell us the event logger is available.
On linux, it may be a bit more difficult, as we may need the platform from ohai to tell us what the default event logger would be for this case. I will make this change.