System::sysctl 1.2
  * Improve example to be more realistic and better show usage.

System::sysctl 1.1
  * Change file editing mode parameter names
  * Add empty_first option to be combined with ensure_present for full file
    content promise.
  * Add test and example policies.

System::sysctl 1.0
  * Supported management policies
  *  entries_present - ensure specified entries exist
  *  entries_absent - ensure specified entries dont exist
  *  defined_only - ensure only specified entries exist aka full file
  *  vars_absent - Ensure no setting for specified var exists
  * Test and debug modes
