Revert "Merge pull request #28 from grosser/grosser/test-load"

This reverts commit 3f512ecf3848a313ec366019f62ae5dbc59e0112, reversing
changes made to 2841450c007aa149ed15cfa9782d4a3a326e7ce2.

Reason: I'll use the solution in
https://github.com/rails/prototype-rails/pull/23 that doesn't check the
Rails environment