Versioning of CSL and the CSL spec

@Dan_Stillman - any input on this?

Not sure what other implementers are around here, but now would be the time to speak up for those folks.

To update, I’m waiting on @bwiernik’s PR, and then plan to merge that and then the new intext element PR.

I haven’t decided yet if I’ll bundle all of this in one 1.0.2 tag, or split the latter off to 1.0.3; or simply leave master untagged for now and we can decide later.