Merge branch 'master' into 'master'

README.md

exercises/exercise-2.md

exercises/exercise-3.md

exercises/exercise-4.md

exercises/exercise-5.md

exercises/exercise-6.md

exercises/exercise-7.md

exercises/exercise-8.md

exercises/images/2-1.png

exercises/images/2-2.png

exercises/images/8-1.png

exercises/solutions-1.md

exercises/solutions-2.md

exercises/solutions-3.md

exercises/solutions-4.md

exercises/solutions-5.md

exercises/solutions-6.md

exercises/solutions-7.md

exercises/solutions-8.md

labs/lab2-reductions-and-prefix-sums/README.md