Allow challenges to examine console output for tests

[kevmoens]

When creating a challenge I would like the ability to capture output. This would allow challenges to be created so we can tell if a loop was used.

'''Csharp public void LoopWhile (double material) { while(material > 0) { Console.WriteLine(material); material -= 1; } } '''

[kevmoens]

create new challenge to list numbers 1-10 all on new lines