Remove path data usage in clipPath

Remove path data usage in clipPath.
Use clipPath in SVG way

lib/attributes.js

@@ -58,10 +58,7 @@ const NodeAttributes = {
     },
     opacity: true,
     clipRule: true,
-    clipPathRef: true,
-    clipPath: {
-        diff: arrayDiffer
-    },
+    clipPath: true,
     propList: {
         diff: arrayDiffer
     },

lib/extract/extractClipping.js

@@ -15,9 +15,9 @@ export default function (props) {
         let matched = clipPath.match(clipReg);
 
         if (matched) {
-            clippingProps.clipPathRef = matched[1];
+            clippingProps.clipPath = matched[1];
         } else {
-            clippingProps.clipPath = clipPath;
+            console.warn('Invalid `clipPath` prop, expected a clipPath like `"#id"`, but got: "' + clipPath + '"');
         }
     }