delete unused classes
Merge branch 'master' into ImageLoader
DiskCache reformat code
ImageLoader v0.2
Added support for loading a URL for a few VIEW (Previously, it was necessary to re-download every time Bitmap for each View)
changes: load from memory without create new thread
DiskCache implements as SlowCache interface with callback data deliver
DiskCache have thread pool for saving/loading images
MemoryCache implements as FastCache
refactor code