Merge pull request kfiroo#89 from ovaris/master

Expose ImageCachePreloader

set version to 1.4.0

Merge pull request kfiroo#38 from sladkoff/master

Allow changing the cache root directory

Merge pull request kfiroo#41 from calvium/expose-generateCacheKey

Export getCachedImageFilePath

Merge pull request kfiroo#28 from hhravn/patch-1

Update README.md