Fix #229.
Fix #228.
Fix #215.
Fix #226.
Word wrap the last few chapters.
Fix #230.
Fix #231.
Add XML support for the format script.

Starting to get something that can be imported into InDesign.
Introduction/Design Patterns Revisited - Markdown

This commit includes Markdown edits to all Game Programming Patterns
chapters through State.

Committing this now in case I mess something up when trying to run the
script or merge changes!
Merge branch 'master' of https://github.com/munificent/game-programming-patterns
Fixed typo
Fixed typo
Fixed another typo

There is a missing "is".
Fixed another typo

Added missing "is".
Fix a few bugs.
Fix chapter links when exporting XML.
Merge pull request #236 from chaficnajjar/master

Fixed typo
Merge pull request #232 from colms/spell-check

Fix #230.
Merge pull request #233 from colms/broken-links

Fix #231.
Merge branch 'laurenbee-master'