Add exercise 2.3, 2.4 and 2.5 to fp-in-scala.
Add exercise 3.2 and 3.3 to fp-in-scala.
Rename packages.
Trivial refactor.
Add exercise 3.4, 3.5 and 3.6 to fp-in-scala.
Use List.apply.
Add another version of dropWhile.