(pup-1369) Add more specs for package/package_settings
(pup-1369) Fixed a bug in package/package_settings

Ruby versions >= 1.9.3 (at least) raised the following exceptions
when validating the package_settings:

  implicit argument passing of super from method defined by
  define_method() is not supported. Specify all arguments explicitly.

This commit fixes the bug.
Merge pull request #2285 from kylog/issue/pup-1369/followup-fix-to-super-bug

Issue/pup 1369/followup fix to super bug