Add specification of setup.rb options for custom boxes
capture installer logs on devel install

as foreman-debug is not available, nor katello
Merge pull request #89 from jlsherrill/devel_log

capture installer logs on devel install
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"]
Merge pull request #87 from ehelms/setup-options

Add specification of setup.rb options for custom boxes
Merge pull request #90 from Ichimonji10/strict-optparse

Make `setup.rb` reject unsupported arguments