Merge pull request #15 from anodelman/multi-version

Multi-version PE installation
Revert "Merge pull request #17 from anodelman/beaker-rspec"

This reverts commit 90c2642b4ad2323cb6c9fe642d7befdf5af7168a, reversing
changes made to 18cef9f78a3d3be4963bbde32cb394c70a83641f.

This change was ineffective and did not actually allow for the use of
the host-file env var.