docs(api): do not generate files for private classes

Closes #684

scripts/docs/processors/hide-private-api.js

@@ -0,0 +1,18 @@
+module.exports = function removePrivateApi() {
+  return {
+    name: 'remove-private-api',
+    description: 'Prevent the private apis from being rendered',
+    $runBefore: ['rendering-docs'],
+    $process: function(docs) {
+      var publicDocs = [];
+       docs.forEach(function(doc){
+        if(!doc.private){
+          publicDocs.push(doc);
+          return doc
+        }
+      })
+     docs = publicDocs;
+     return docs;
+    }
+  }
+};