Update 2.md

- Minor editing for readability.
- changing sample code to follow conventions used in this book.
Update outline.md

minor fixing, to improve readability.
Update README.md

Fixing Appendix Title, matching it with related document.
Update I.md

Fixing Appendix title.
Merge pull request #24 from kr15to/patch-6

Update I.md
Merge pull request #23 from kr15to/patch-5

Update README.md
Merge pull request #21 from kr15to/patch-4

Update outline.md
Merge pull request #19 from kr15to/patch-2

Update 2.md
Add `How to Debug a Lua Game` for 11 chapter
Merge branch 'master' of https://github.com/chukong/programmers-guide
Merge pull request #25 from samuele3hu/master

Add `How to Debug a Lua Game` for 11 chapter