#14 Fibonacci

[somekindofwallflower]

Description
Print out the n-th entry in the fibonacci series.
The fibonacci series is an ordering of numbers where
each number is the sum of the preceeding two.
For example, the sequence
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
forms the first ten entries of the fibonacci series.

Example:
fib(4) === 3