Add release notes for 2.0 beta 3.

Review Request #5507 — Created Feb. 19, 2014 and submitted — Latest diff uploaded

Information

Review Board
release-2.0.x
d7906d5...

Reviewers

These are the release notes for the upcoming beta. They're larger than
the 1.7 release notes.

Since that's pretty self-explanatory, I'd like to use the rest of my
time to provide some stats.

Here's the top 6 largest release notes we've put together:

* 767 - 2.0-beta-3.rst
* 698 - 1.7.rst
* 697 - 1.6.rst
* 538 - 2.0-beta-2.rst
* 527 - 1.5.rst
* 526 - 2.0-beta-1.rst

I think we're good on 2.0.

I've also changing the naming of the existing 2.0 beta images to
2.0-*.png and updated the older release notes. This is because Sphinx
dumps all images into a single directory, and this will help us
namespace that output in the future.

Built the docs and went through them.