set defaults and fetch from our hash. Should be easier to debug now instead of NilClass errors.
ensure super happens before we set variables.
these attributes are nested in our install_options hash.
add 11.6.0, add debian, newer boxes, better names for our instances. nest the attributes in install_options for consistency though they dont need to be in a hash named install_options they just need to be passed to the install_options attribute.
include version specification. move url, checksum, version under install_options
update documentation.