Add vulcanize to tools.

tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/cheerio-select/node_modules/CSSselect/node_modules/domutils/lib/traversal.js

Index: tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/cheerio-select/node_modules/CSSselect/node_modules/domutils/lib/traversal.js
diff --git a/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/cheerio-select/node_modules/CSSselect/node_modules/domutils/lib/traversal.js b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/cheerio-select/node_modules/CSSselect/node_modules/domutils/lib/traversal.js
new file mode 100644
index 0000000000000000000000000000000000000000..b4b413f6587f1156d72915ffbca47a4966fbc26f
--- /dev/null
+++ b/tools/vulcanize/node_modules/vulcanize/node_modules/cheerio/node_modules/cheerio-select/node_modules/CSSselect/node_modules/domutils/lib/traversal.js
@@ -0,0 +1,24 @@
+var getChildren = exports.getChildren = function(elem){
+	return elem.children;
+};
+
+var getParent = exports.getParent = function(elem){
+	return elem.parent;
+};
+
+exports.getSiblings = function(elem){
+	var parent = getParent(elem);
+	return parent ? getChildren(parent) : [elem];
+};
+
+exports.getAttributeValue = function(elem, name){
+	return elem.attribs && elem.attribs[name];
+};
+
+exports.hasAttrib = function(elem, name){
+	return hasOwnProperty.call(elem.attribs, name);
+};
+
+exports.getName = function(elem){
+	return elem.name;
+};