Update use interface

The support was wonky in some places.

* Remove support for passing a processor to `use`;
* Add support for passing a `list`, `matrix` to `use`;

Closes GH-5.
Related to remarkjs/remark#144.

package.json

@@ -14,7 +14,7 @@
     "remark"
   ],
   "dependencies": {
-    "attach-ware": "^1.0.0",
+    "attach-ware": "^2.0.0",
     "bail": "^1.0.0",
     "extend": "^3.0.0",
     "unherit": "^1.0.4",

readme.md

@@ -162,13 +162,22 @@ Change the way the processor works by using a plugin.
 
 **Signatures**
 
-*   `unified = unified.use(plugin[, input...])`;
-*   `unified = unified.use(plugins)`.
+*   `processor.use(plugin[, input...])`;
+*   `processor.use(plugins[, input...])`;
+*   `processor.use(list)`;
+*   `processor.use(matrix)`.
 
 **Parameters**
 
 *   `plugin` (`Function`) — [Plugin][].
+
 *   `plugins` (`Array.<Function>`) — List of plugins.
+
+*   `list` (`Array`) — List where the first value is a `plugin`,
+    and further values are `input`;
+
+*   `matrix` (`Array`) — Matrix where each entry is a `list`.
+
 *   `input` (`*`) — Passed to plugin.  Specified by its documentation.
 
 **Returns**