Allow Application to Add the permission "WRITE_EXTERNAL_STORAGE"
Issue #301 - NPE in ImageLoaderEngine
Not null executors, shutdown built-in executors on engine stop
Merge pull request #311 from sherifelkhatib/master

Allowing Apps to omit "android.permission.WRITE_EXTERNAL_STORAGE" even when sdcard is mounted
Merge branch 'master' of https://github.com/nostra13/Android-Universal-Image-Loader.git
Refactored StorageUtils
Merge remote-tracking branch 'clone/master'