Some changes for workshop exercises

[drumusician]

Hey @Tuxified,

Here are some changes to the exercises for Week 1.

Mostly language specific small changes, but also two actual implementation changes.

• FizzBuzz => Changed it to reflect the actual FizzBuzz that has Fizz as divisible by 3 and Buzz for 5

• determine pair
  => I changed the tests to individual verify (not sure what you were doing there, so forgive me if I broke your code there...)
  => modified the solution for determine pair. Let me know if you like it. There might be a more concise solution still and I would really love your feedback ;)

Thanks.