Excluded docName key from API controller method map

- due to the structure of our API controllers, the docName and methods
  are under the same structure
- this code loops over the keys of the controller and forms the method
  map
- however, it currently also loops over every character of the docName,
  so the resulting map contains a weird structure of chars
- we don't need the docName for this, so we can just exclude it from the
  keys
- this doesn't change any functionality

ghost/api-framework/lib/pipeline.js

@@ -186,7 +186,7 @@ const pipeline = (apiController, apiUtils, apiType) => {
         return controllerMap.get(apiController);
     }
 
-    const keys = Object.keys(apiController);
+    const keys = Object.keys(apiController).filter(key => key !== 'docName');
     const docName = apiController.docName;
 
     // CASE: api controllers are objects with configuration.