2.0

Hi

What be really nice if you had time to review this.
I'm thinking of doing a pre release (2.0.0.alpha.1)
I've just done a very simple app, as described in the in the README and it works for me.
All the tests works excepts three tests.
In order to run tests, the latest devise tests must be used as specified in Gemfile (we got pull request accepted both for devise and orm_adaptor :-).

Is this empty shim module necessary?