Worldwide office types

Worldwide offices need a type, so we're providing it.  There's a bit of future proofing in that types have a grouping (the first set of types we have are all about FCO) and it's mandatory.  We hope that the other orgs will also have types and we can fill them in and group as we go.

These office types are presented in the api for world orgs as a type key in the details hash for each office.

For: https://www.pivotaltracker.com/story/show/45681209