function onGlob( error, files ) {
			if ( error ) {
				debug( 'Encountered an error when searching for files in directory: %s. Error: %s.', pkg, error.message );
				return clbk( error );
			}
			debug( 'Found %d files matching search criteria in directory: %s.', files.length, pkg );
			readFiles( files, onRead );
		}
Callback invoked after matching files.

@private
@param {(Error|null)} error - error object
@param {(StringArray|EmptyArray)} files - matching files
@returns {void}