Various commits for RSpec2/Rails3 compatability

[timlinquist]

We've been migrating to Rails3 and have a few fixes here. We've been using this fork with these 7 commits on Rails3 for a few weeks now. Everything appears stable so now seemed like a good time to submit a pull request.

Fixes courtesy of @amerine, @srbaker, and myself.

[jeroenvandijk]

Hi Tim,

I've tried to get the (dataset) tests running for your fork but failed didn't get far. Did you get them running and passing? If so, it would be very cool if you could add a Gemfile that would define all dependencies.

Jeroen

[amerine]

This is stale. Should we close it?