release notes restructuring

[Luis Villa <luis villa gmail com>]

I'd like to completely revamp the release notes from the format
they've been following for a while.

The current outline is something like:

I. New stuff
II. Docs
III. i18n
IV. Standards Compliance
V. Installation
VI. Known Issues
VII. The Future
VIII. Getting Involved

I'd like to reshape it a bit, to look more like:

I. Features for users (new, then highlights of the old) (integrate
i18n, a11y here)
II. Features for developers (new, then highlights of the old)
(integrate i18n, a11y, standards here)
III. Features for deployers (new, then highlights of the old)
(integrate platform info, a11y here)
IV. Getting the release
V. Known Issues
VI. The Future
VII. Getting Involved

I'll upload a draft reorg like the above in the next couple of hours;
would love commentary/feedback then.

Luis