Version 1.3

Hi @vlad-ghita

So as we agreed [here](https://github.com/vlad-ghita/image_upload/issues/9#issuecomment-12485897), this PR contains a checkbox in the settings in order to prevent the extension from resizing.

Max values validation have been added and are checked only if the resize checkbox is off. This checkbox is enabled by default.

Basically, I wanted to retain the same behavior that is as.

I also added some output in order to communicate the max and min values to the client.

The only thing missing would be the release date in the xml file.

Hope you like it.