I need to parse the ENV with a gem loaded from bundled gems, therefore I need to use Bundler.setup first and Bundler.setup(environment) afterwards.
You can call Bundler.setup more than once. Here is a spec that passes on master that demonstrates how it works: http://gist.github.com/305396
Going to close this for now. If you have something specific that you need, please describe it, or better yet write a failing test.
Adds support for gem bundle --only. Closes #46; Closes #81