The loop was checking 'for i.Done()' instead of 'for !i.Done()',
which prevented the comment content from being consumed.
This caused the tokenizer to treat comment text as code.
Add '#' comment syntax that works like Python comments.
Comments can take up a whole line or appear at the end of a line.
All characters after '#' until the next newline or EOF are ignored.
Closes#24
mvhutz
