Platform support policy proposal

There is a fair amount of confusion about the specific operating system platforms, platform versions, etc. that Chef Software, Inc. supports for its products. This RFC will clarify this by calling out the individual operating systems and their releases as explicitly supported or not.
@lamont-granquist I think we're getting into implementation details now (CVT vs omnibus tester) -- however the client team does post-build verification is up to you. All I mean to say is that tier 1 platforms should have *some* sort of post-build verification, because we've gotten burned in the past (example: critical resources on Solaris not working)

It also need not mean that we have all these things running permanently, or that we do post-build verification on every single build. My intent is just to say that "before we ship a GA for xyz, we should have run some kind of smoke test on the exact platform variant & version we claim to support".