def _parse_archive(self, targz, dest):
        '''parse_targz will add a line to the install script to extract a 
           targz to a location, and also add it to the files.

           Parameters
           ==========
           targz: the targz to extract
           dest: the location to extract it to

        '''

        # Add command to extract it
        self.install.append("tar -zvf %s %s" %(targz, dest))

        # Ensure added to container files
        return self._add_files(targz, dest)
parse_targz will add a line to the install script to extract a 
           targz to a location, and also add it to the files.

           Parameters
           ==========
           targz: the targz to extract
           dest: the location to extract it to