Update to allow EL7 bats to run.
Merge pull request #91 from ehelms/allow-el7-bats

Update to allow EL7 bats to run.
Make `setup.rb` reject unsupported arguments

Call `OptionParser#abort` if unsupported arguments are provided. For example:

    $ ./setup.rb foo
    setup: Received unsupported arguments: ["foo"]