Add thrid exercise.
Add first things for next exercise
quick merge
Fixed some issues and finished equal_by_trans
Fixed some more issues and finished exercise. Some more tests are still necessary
Fix formatting in tests.
Added documentation for exercise 3a
Merge branch 'tim' of https://github.com/kumpelblase2/RubyUniversityExercises into tim
Add changes from university.
Fix wrong exercise.
Merge branch 'tim' of https://github.com/kumpelblase2/RubyUniversityExercises into tim

Conflicts:
	Aufgabe_3/lib/day.rb
	Aufgabe_3/test/day_test.rb
Fix formatting and some small changes.
First attempts for exercise 4.
Add documentation for exercise 3
Add changes made in university.
Merge pull request #6 from kumpelblase2/tim

Finish things for exercise 3