Kivy Lesson 11 Slider

I have decided to introduce the slider widget since I want to use it within the paint app.
The code for the project is here:
https://gist.github.com/anonymous/fe94a9c88ba8005377951ea4b095ee5e

https://gist.github.com/anonymous/c5d6eeaa7dfaea661881390958fb9aad