New parameter: version

This new parameter will offer the chance to create a new thumbnail from the same URL. This is useful if an image change over time but the URL stay the same.

Example, without version parameter:

With version parameter:

This version (v2) will create a fresh thumbnail. If the image changed, each rethumb URL will have a different thumbnail, like a snapshot in time.

The version parameter have a maximum of 16 characters and accepts A-Z, a-z and 0-9.