Add `cd -`, `history`, and interpolating command lines from history

[ussuri]

@rginda: if LGTM, please land yourself or wait when I'm back from vacation.

• cd - will cd to the previous directory, as in shell;
• history will print history with indices, as in shell; history 10 will print 10 last commands; history -c will clear the history;
• If command number 123 is cd exe, !123 will print "cd exe" and then execute it; echo "something !123, !123" will print "something cd exe, cd exe".

[ussuri]

@rginda: ping. This should be pretty uncontroversial.

[rginda]

I'm not a fan of the bang parsing, I think we can do without that for now. The rest looks ok to me.

[ussuri]

Ok, removed the bang parsing for now.