small tip to ensure avoid any cache
force browsers to renew their cache when an image is updated
browsers does not use cache on preview
Revert "small tip to ensure avoid any cache"

This reverts commit 925178191bb610b93e1021078fd1490a30d08453.
Merge pull request #116 from vrcAlbert/feature/force_uncache_back_images

force browsers to renew their cache when an image is updated
Merge pull request #99 from vrcAlbert/cache_server

small tip to ensure avoid any cache
Merge remote-tracking branch 'origin/master/chiba2' into master/dubrovka