added element conversion examples

sample-code/examples/node/protractor-bridge/example_spec.js

@@ -43,5 +43,22 @@ describe('angularjs homepage', function () {
       }).nodeify(done);
     });
 
+    it('should convert to wd element', function (done) {
+      var el = element.all(by.repeater('todo in todos')).get(1);
+      wdBrowser.wdEl(el).text().then(function (text) {
+        expect(text).toEqual('build an angular app');
+      }).nodeify(done);
+    });
+
+    it('should convert from wd element', function (done) {
+      return wdBrowser
+        .elementById('add-some-control')
+        .then(function (el) {
+          return wdBrowser.swEl(el).getText().then(function (text) {
+            expect(text).toEqual('Add Some Control');
+          });
+        }).nodeify(done);
+    });
+
   });
 });