Just a few wording changes in places where I stumbled while reading through.
Updates to Chapter 7 (Common Problems & Solutions)

- Shortened section titles and added subheaders 'Problem' and
  'Solution' sections (except second section, for which the
  problem being addressed was unclear).

- Reworded first section (View Nesting); minor rewording and
  corrections elsewhere.

- Switched order of sections regarding rendering parent from child
  and triggering updates in other views.

- Added 'validate: true' flag to the call to set in the ValidateAll
  example (0.9.10 change).
More wording, grammar and whitespace fixes
Extra comma
Merge pull request #329 from wibblymat/nits

Wording and grammar changes
Merge pull request #331 from seanrose/patch-2

Extra comma
Minor changes to chapter 4
Merge pull request #327 from dcmaf/gh-pages

Updates to Chapter 7 - Common Problems & Solutions
Merge pull request #332 from wibblymat/chapter-4-nits

Minor changes to chapter 4
simplifying language in the why backbone section
tidying up line about state in single-page apps
cleanup of line on templating/JSON
fix for template example
correction regarding callback
dropping unnecessary vars for sync pattern
Some spelling and grammatical fixes.
Merge pull request #335 from aodin/gh-pages

Spelling and Grammar in Chapters 7, 8, and 9