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.
Right, problem is that we will kinda start to waste our time now with "Tier 3" support for Arch.  As people find that random header files are picked up, the health_check fails, and we wind up accepting patches to add --without-whatever to the configure lines.  At some point it might be easier to just officially produce a build for it.  Although, while there was a flurry of activity recently, it seems to have died down a bit.