First part of the chapter 5 addition (Issue #65)

First 13 pages out of 19
typos & grammar
Merge pull request #72 from limenet/chapter5

Chapter 5_1: typos & grammar
Finished additional content chap 5 (Issue #65)

Only missing a drawing
typos & grammar
Merge pull request #73 from limenet/chapter5

Chapter 5_1: typos & grammar II
Layout improvements
Final changes for chapter 5
Merge branch 'chapter5'