[threeten-dev] Duration/Period change

[Stephen Colebourne]

The proposed changes has been described in more detail on the issue:
https://github.com/ThreeTen/threeten/issues/248

Basically, it removes the time-fields from Period, and extends the
usabaility of Duration without changing its underlying nature or class
names. This is a simplification that seems beneficial in the codebase.

Javdoc for (most of) the proposed change is here:
http://threeten.github.com/threeten/dev/periodduration/

Stephen