cache/cache library

1. disposable_cached_images package
2. documentation
3. cache/cache.dart

disposable_cached_images package

1. Libraries
2. cache/cache
3. cache/image_cache_stub
4. cache/interface
5. cache/web_cache
6. disposable_cached_images
7. image_info_data/image_info_data
8. image_info_data/image_info_data_stub
9. image_info_data/image_size
10. image_info_data/web_image_size