Removed unneeded using statements.
Added tiny test puzzle builder to aid in testing API calls.
Change Get with no args call to return not implemented instead of a hardcoded puzzle.
Added a hard-coded tiny test puzzle.
Added a check call to the puzzle api to check solutions.
Rename ValidationResult.WasSuccess to WasValid
Added a getById and check tests for PuzzleController.
Merge branch 'develop' into feature/angular-ui