Changed API: Removed context reference from ImageLoader.loadImage(...)
parameters. Keep app context in configuration.
Sample: Used new API of ImageLoader.loadImage(...)
Fixed Java docs
Renamed FileUtil -> IoUtil. Close all streams silently.
Clean code
Introduced DiscCacheUtil
Not process images from FTP by default.
Made FlushedInputStream buffered
Sample: Clean code
Recycle old bitmap in RoundedBitmapDisplayer
Java docs
Introduced `DisplayImageOptions.preProcessor(...)` and
`postProcessor(...)`. Added `ProcessAndDisplayImageTask`.
Revert "Recycle old bitmap in RoundedBitmapDisplayer"

This reverts commit bcde84ac96e239ca1299a86676b30c4b625a8ff3.
Java docs
Fixed versions in manifests
Clean code
Try to cache image on disc first if it can't be decoded directly from
network
Extracted static methods for convenient using from outside
Sample: Stop ImageLoader only on back pressed
Sample: Set memory cache size as 1/8 available app memory