Support different target-sizes for list items
Change and remove some leftovers from testing and autoformating
rename preloadItem(List<T> items, int position, boolean isIncreasing) to preloadAdapterPosition(List<T> items, int position, boolean isIncreasing)
Merge pull request #273 from DavidWiesner/feature-ListPreloader-support-multiple-sizes

Feature list preloader support multiple target sizes