Result output should at least have the option to be sorted

[ssokolow]

Both to allow reliable comparison of the output (either between regular and --exact mode or between two different code revisions) and for user comfort, there should at least be an option to sort the output.

I'll need to do some experimenting with python -m timeit to determine what kind of sorting to use and what to make optional.

For example:

• Natural/human sorting rather than ASCIIbetical would be best, but I don't know how much heavier it is.
• It'd probably be most useful to sort paths component by component so that files with the same names get put side-by-side so it's easier to compare and contrast.