Finish presentation and fix stuff...
Using flatmap instead of reduce to get list of players
Added exercises for Optional
improved implementation of exercise.
Removed scala
Simplified asList-method
Added implementation of functions and predicates for ex1
Cherry-pick 322a5794753a10857d312044c0de81df6c9d3f3d
Fix slides for lambda.
Change source url in slides.
Update README.md
Update README.md to include Optional exercise.
Improve listing of Stream operations, with examples.
Fix repo URL in README.md.
Restructure slides to match progression in exercises.
Small refactor of exercises.
Add exercise.
Make car example more explicit.
Remove Ex6.
Add some exercises, and moved one.