My Bundler / Cucumber / rails 3 issue last night

[Doon]

So lots of poking around and printing / teeing the env on various
calls, I finally got it working.

This commit fixes it..

http://github.com/doon/email-spec/commit/fd96a7a3f2fd596b6be2cb1859b164d1bc2e1c5b

Basically I mess with the BUNDLE_GEMFILE path in the ENV if it is the
rails3 app that we are trying to test.

This fixed all the issues running inside the bundled environment and
running from the rakefile as well.

-Patrick