convert property key to computed before checking if it's a displayName property in the react transformer builder - closes #1671

test/core/fixtures/transformation/react/display-name-if-missing/actual.js

@@ -1,6 +1,13 @@
 var Whateva = React.createClass({
   displayName: "Whatever",
   render: function render() {
-  return null;
+    return null;
+  }
+});
+
+var Bar = React.createClass({
+  "displayName": "Ba",
+  render: function render() {
+    return null;
   }
 });

test/core/fixtures/transformation/react/display-name-if-missing/expected.js

@@ -4,3 +4,10 @@ var Whateva = React.createClass({
     return null;
   }
 });
+
+var Bar = React.createClass({
+  "displayName": "Ba",
+  render: function render() {
+    return null;
+  }
+});