chore(docs): update to dgeni-0.4.0

* update package with new services and computeId config
* generateIndexPagesProcessor was not using log
* use StringMap not ES6-shim Map in errorNamespaceMap
* remove unused dependencies from generateErrorDocsProcessor
* ensure generatePagesDataProcessor adds its doc to the collection
* debugDumpProcessor was moved to dgeni-packages

docs/config/services/errorNamespaceMap.js

@@ -0,0 +1,10 @@
+"use strict";
+var StringMap = require('stringmap');
+
+/**
+ * @dgService errorNamespaceMap
+ * A map of error namespaces by name.
+ */
+module.exports = function errorNamespaceMap() {
+  return new StringMap();
+};