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 
https://github.com/opscode/omnibus-chef/commit/648256a23a967d7d0bfc82e5f852a5d09a5e0074
Needs to be updated to work with changes to omnibus, but source.wxs should be correct.