Add support to sort files in ls command by time

[bbaja42]

Similar to how unix ls works, param could be -t

[bbaja42]

If this is considered a good idea, I'm happy to take a stab to implement it.

[colinmarc]

Hi @bbaja42,

Sorry for the eternally delayed response. That seems like a great idea - I'd add -c, -u, and -U while you're at it.

Thanks for the suggestion!