Merge in v5 code

scripts/docs/dgeni/processors/mark-properties.js

@@ -0,0 +1,15 @@
+"use strict";
+module.exports = function markProperties() {
+  return {
+    name: 'mark-properties',
+    $runBefore: ['rendering-docs'],
+    $process: docs => docs.map(doc => {
+      for (let i in doc.members) {
+        if (doc.members.hasOwnProperty(i) && typeof doc.members[i].parameters === 'undefined') {
+          doc.members[i].isProperty = true;
+        }
+      }
+      return doc;
+    })
+  }
+};