Just a few wording changes in places where I stumbled while reading through.
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
Chapter 8 - Minor revisions/corrections

Also a typo correction in Chapter 14.
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

Conflicts:
	chapters/08-extensions.md