Extract the core to be used as a single library

[rocboronat]

Hi, @collicalex!

I arrived here from https://collicalex.github.io/JPEGOptimizer/, googling "jpeg optimizer java".

I want to use your project in a Java server application. Do you think the project is stable enough to be used in a production environment? And is there any way to use the project as a library inside another application?

Thanks a lot!

[rocboronat]

Hi again! Some weeks ago I forked your project, vampirized it and released as a library reusable in JVM applications. Here it is! https://github.com/Fewlaps/slim-jpg I remade everything except your method to know the difference in % of two pictures. As you didn't answer this issue nor #1, I decided to add you in the license file of the project. Is it ok for you? Feel free to request me to change anything. I didn't know what to do in this situation so I opted to do the best I could. Well, feel free to share your thoughts! :·)