Figure Out a Way to Cache The Items

Reference from [Android here](http://developer.android.com/guide/topics/data/data-storage.html).
Reference from [StackOverflow here](http://stackoverflow.com/questions/6276358/pros-and-cons-of-sqlite-and-shared-preferences).

TL;DR: SharedPreferences or SQLite?

Plus, what's to cache? Top stories? How about comments?
