Added 'size of' to arrays and fixed return-bug

You can now get the size of an Array by writing
>> a equals [1,2,3]
[1,2,3]
>> size of a
3

Fixed a critical bug causing all functions to have a static return value.
This meant that if you called a function twice, it would always return the value
of the first time it evaluated
Cleaned up and renamed recursive fibonacci

It also works now btw
Moved quicksort to test-code

Since it now works, it can be a part of the testing code
added fibonacci-recursive and quicksort to test cases