title: Persisting data between app launches
body: <p>I have small set of data to be persisted between different app launches... This data is the versions of some files which I will be checking on my app launch. I am planning to maintain a dictionary with key a file name and value as version of the file.</p>
  
  <p>What is the best possible option to persist this data. I could think of using NSUserDefaults for this.</p>
  
  <p>Please guide.</p>