count number of ones in an integer
added fibonacci number
Updated detect endian code
spiral printing
https://www.codeeval.com/open_challenges/57/
T9 algorithm and code
Added prefix expression test data
https://www.codeeval.com/open_challenges/7/
Added stack test data
https://www.codeeval.com/open_challenges/9/
Added number pairs test data
https://www.codeeval.com/open_challenges/34/