More consistent whitespace handling

[cdwfs]

[This is an issue we ran into weeks ago; I may not remember the details exactly. Please forgive me.]

While working our way through Terminal Quest, we noticed that there seems to be a mismatch between what the underlying Unix shell accepts as valid command input vs. what the game recognizes to advance the tutorial. Specifically, extra whitespace was no problem for the shell, and it would produce the expected output, but the game wouldn't advance to the next step and insist that you typed the command wrong. I believe we encountered similar issues in other Kano apps as well.