Completed Koans #8 - Higher Order Functions
Completes Koans #9 - Runtime Polymorphism
Completed Koan #10 - Lazy Sequences.

Identity function was a handy one for iteration.
Completed Koans #11 Sequence Comprehensions
Completed Koan #12 - Creating Functions
Completed Koan 13, Recursion
Completed Koans #14 Destructuring
Finished Koans #15 - Refs