Quick fix for Simplecta making too many queries.

Hello! My name is Ye Paing, I'm a student of Professor. Schaffer at Hunter college. We're currently using your Google App Engine app Simplecta as a backend for one of our Senior Android app projects.

A lot of us were running into the following error "API error 5 (datastore_v3: TIMEOUT)" caused by the app making too many queries on the datasource. I've made a quick fix to stop the app from making too many queries (more detail in the comments and logs).

If it's not too much trouble and you feel that my quick fix is a viable solution for the time being, could you please update the code on Simplecta so that we can continue working on the front end Android app for Simplecta without having to keep deleting posts/rss subscriptions to keep the queries low?

Thank you in advance for taking time to consider my pull request.
-Ye