The Android [documentation](http://developer.android.com/reference/java/io/File.html#deleteOnExit%28%29) states that [this](https://github.com/mttkay/ignition/commit/2a9cc0f66e540f8b8cf6875716efc6f7d9dac3fd#diff-75961b663dbd48f060524c65555bc5a1L231) is not guaranteed to delete the file that has been written to the cache.
The Android documentation states that this is not guaranteed to delete the file that has been written to the cache.