[Amforth] amforth-shell.py, a small new feature

[Enoch <ix...@ho...>]

Hello AmForth-ers,

May I suggest the following humble patch to the fabulous shell.

Adds --log argument to the shell invocation line to collect the
"distilled" Forth lines that were uploaded to the microcontroller
system.

http://pastebin.com/pgeZRjGH

Regards, Enoch.