Add engines field in templateEngine

CHANGELOG

@@ -44,6 +44,8 @@ combine it with graph names.
 
 * fixed undefined behavior in AQL function `PARSE_IDENTIFIER`
 
+* added "engines" field to Foxx services generated in the admin interface
+
 * added AQL function `IS_SAME_COLLECTION`:
 
   *IS_SAME_COLLECTION(collection, document)*: Return true if *document* has the same

js/server/modules/@arangodb/foxx/templateEngine.js

@@ -139,9 +139,12 @@ _.extend(Engine.prototype, {
   buildManifest: function() {
     var manifest = {
       name: this.name,
-      description: this.description,
-      author: this.author,
       version: '0.0.1',
+      description: this.description,
+      engines: {
+        arangodb: '^2.8.0'
+      },
+      author: this.author,
       license: this.license,
       controllers: {},
       scripts: {