Code for Chapter 5

Recipes:

	Separating with the screen manager
		e1.kv
		e1.py
	Using drawing instructions
		e2.kv
		e2.py
	Using context instructions
		e3.kv
		e3.py
	Working with manipulating instructions
		e4.py
	Rotating, translating, and scaling the canvas
		e5.kv
		e5.py
	Modifying with multitouching
		e6.py
	Storing and retrieving the coordinate space context
		e7.kv
		e7.py
	Introducing animations
		e8.kv
		e8.py