Minor fixes in 1.5
remove stray and random git in a comment
Chapter 1
Chapter 2
Chapter 3
Chapter 6
Chapter 8/9
formula alignment layout changes chap 6
Merge pull request #11 from bimmlerd/Chap1.5

Merging changes for Chap1.5
Revert 6787e70..ea26ece

This rolls back to commit 6787e70c1125184c63e401debdd7fc76d4bb228b.
solving conflicts
push