2.0 release

This is the main effort for the 2.0 release.  It covers dropping Rake support, reworking settings/initialization/setup, and a bunch of cleanups along the way.

I'd like to merge this effort and roll a release candidate.  I've branched off a `1.0-stable` branch for bug fixes and development for 1.0 releases.

@jcredding rolling rc1, FYI.