Replace type: "bare" with type: "server" in attributes.json. This now just
means "only make one server process" rather than controlling the boot script.
Programs that are type: "traditional" that want to be a webapp now need to
explicitly depend on the webapp package.
This code depends on PR 680. In addition, the docs include a link to
the proposed AppCache wiki page.
Adds the appcache smart package and associated documentation.
QA notes are in packages/appcache/QA.md (Is this a good place to put
them?)
