integrity/integrity — pull request #183 by jarthod (2012-10-29 20:41:19+00:00)
Title: Fix rbenv ENV propagation issue

I'm using rbenv and I had the following issue:
my tests (using rbenv) were run with integrity's `RBENV_DIR` environnement variable.
This means ruby version specified in my project's `.rbenv-version` were not used, the tests always runned with the global ruby version.

I fixed it by cleaning the `RBENV_DIR` variable the same way you did for the bundler variables.