Replace each tab with 4 spaces.
Preliminary SequenceType.
Preliminary .nextLine().
Pass test_goodFileInput_returnsLines().
Pass test_twoFileInput_iteratesBothFiles().
Pass test_longFileInput_preservesLongLines().
Simplify test function names.
Let Swift do pointer conversion.
Defer debugger symbol issue.

Wait and see if Apple fixes it.
Pass script test for bad input.
Replace file name with file path.
Merge branch 'feature/fileInputClass'