Chapter 5 - first draft

Added first draft of Chapter 5, which deals with the license changes at
Movable Type in 2004. Also touched on ongoing relationship between
MT/WP.

Added images for the first time.
Still needs:
- input from Matt on MT/WP relationship
- screenshots of MT admin and blogger admin
Merge pull request #22 from smckeown/master

Chapter 5 - first draft