Refactor puzzle one

This merge request contains changes to the coding puzzle following feedback from @tpage. The following changes have been made:

+ Renamed the packages to be clearer
+ Added unit tests with the correct answers for the first 3 questions
+ Updated the instructions to make implementation requirements clearer

There's no unit test for the 4th part of the test as it is left to the user to define success. 

@tpage  - Can you check the answers I've put in the tests against yours to make sure we have the same values.

See merge request !2