Note: the options "verbose" and "debugfile", when provided, are noted and then deleted from the root object space, so that if your RiveScript code uses variables by the same values it won't conflict with the values that you passed here. Load a directory full of RiveScript documents. $PATH must be a path to a directory. @EXTS is optionally an array containing file extensions, including the dot. By default @EXTS is ('.rive', '.rs').