Spatial Partition Edits v1

Initial round of edits--still have outstanding questions.
Spatial Partition Edits v2

A few more edits!
Merge remote-tracking branch 'upstream/master'
Spatial Partition Edits v3
small spelling changes
Correct does't -> doesn't in observer.markdown
Merge branch 'master' of git://github.com/laurenbee/game-programming-patterns into laurenbee-master

Conflicts:
	book/spatial-partition.markdown
	html/spatial-partition.html
Fix typo in Observer

wantonly -> want only
Merge pull request #152 from 9034725985/patch-1

small spelling changes
Merge pull request #153 from rossng/master

Correct does't -> doesn't in observer.markdown
Merge pull request #164 from eugene-bulkin/master

Fix typos in "Architecture, Preformance and Games"
Merge pull request #167 from Kernald/patch-1

Fix typo in Observer
Fix #143.
Fix #140.
Fix #145.
Fix #147.
Fix #150.
Fix #151.
Fix #155.
Fix #156.