fix task 3 description
fix task 7 description
fix task 8 description
Merge pull request #7 from jcranky/patch-3

fix task 8 description
Merge pull request #6 from jcranky/patch-2

fix task 7 description
Merge pull request #5 from jcranky/patch-1

fix task 3 description
Merge branch 'master' of https://github.com/devoxx4kids/materials