Merge pull request #40 from fptudelft/content

material for chapter 9 and 10
transcript chapter 10 part 3
Merge pull request #41 from Lars6/master

transcript chapter 10 part 3
Fixed some typos in subtitles (up to Countdown pt 2).
Merge pull request #42 from pbl64k/classes-srt

Fixed some typos in subtitles (up to Countdown pt 2).
Lazy Evaluation - slides + transcripts