Reviewed 9-TargetCell.pier (Chapter 10)
Merge pull request #11 from bencoman/targetcell

Review of Chapter 9 TargetCell done
Ignore some more patterns
My pass on Chapter 1
My pass on chapter 3
Review of Grid Chapter 11 (10-Grid.pier)
Merge pull request #12 from bencoman/grid

Review of Grid Chapter 11 (10-Grid.pier)
Minor spelling/grammar, Ch9 MirrorCell

This reverts commit 251eaa25a8a90cb70e1402016360f5da77d2e236.