Revert "specs and features files are called from working directory"

This reverts commit 62a25a7b392e0d47719486894a1c11d24e235f5d.

The tests that mock expand_path don't represent what expand_path
actually does, so these tests can't be trusted. The main issue is that
specjour is now finding globs within the whole project, not confined to
the passed in directory (spec/models for instance).
Fix Rails already initialized error (again)

The initial fix expanded the test paths, which would break when
distributing from Mac to Linux (/private/tmp instead of /tmp). Now, we
utilize the fact that Cucumber checks for RAILS_ROOT to ensure the
environment isn't loaded twice (by non-unique paths).
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