Fixed the Arch Linux Install example (@maxmeyer).
Merge pull request #86 from tmatilai/test-runner-exit-code

Fix test runner's exit code if any test fail
Merge pull request #83 from tmatilai/unset-version-file

Unset RUBY_VERSION_FILE when loading auto.sh
Unset RUBY_VERSION_FILE at the top.
Drop shebangs from bug_report and test scripts

At least `[[ ]]` and arrays are not Posix shell compatible.
And anyway it is better to run the scripts by default using
the current SHELL.