add memoryCachePercent method
fix a bug
use Runtime.getRuntime().maxMemory() instead of memoryclass
remove ununsed import
fix a bug
Readme: Added app using UIL
Allow Application to Add the permission "WRITE_EXTERNAL_STORAGE"
Readme: Added apps using UIL
There was an issue where "lastUsageDates" in LimitedDiscCache had some
cache files that were not in cache directory, so LimitedDiscCache wasn't
removing the cache files. 

It usually happened in ListView, so to solve this issue, I modified
removeNext() method in LimitedDiscCache.
Readme: Added apps using UIL
Merge pull request #279 from googolmo/percent

add memoryCachePercent method
Merge branch 'master' of https://github.com/nostra13/Android-Universal-Image-Loader.git
ILC.memoryCachePercent() -> memoryCacheSizePercentage(), refactored
method
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 pull request #316 from ncoolz/master

Handle deletion of files from disc cache, keep lastUsageDates actual.
Clean code
Issue #309 - Introduced bitmap processor for disc cache (in ImageLoaderConfiguration.discCacheExtraOptions(...))