Update style-rewriter.js

Added fix for deep selectors as mentioned on vuejs#197

Author: ellukesmith

lib/style-rewriter.js

@@ -18,6 +18,18 @@ var addId = postcss.plugin('add-id', function () {
         selectors.each(function (selector) {
           var node = null
           selector.each(function (n) {
+            if (n.type === "combinator" && n.value === ">>>") {
+                n.value = " ";
+                n.spaces.before = n.spaces.after = "";
+                return false;
+            }
+            if (n.type === "tag" && n.value === "/deep/") {
+                var next = n.next();
+                if (next.type === "combinator" && next.value === " ") {
+                    next.remove();
+                }
+                return false;
+            }
             if (n.type !== 'pseudo') node = n
           })
           selector.insertAfter(node, selectorParser.attribute({