dfa - a trivial finite automaton module

[Ian Zimmerman]

I have just uploaded my dfa-0.1 module to PyPi.  I have seen similar
or equivalent code in other packages (e.g. FSM in pexpect) but it
was not as general or just used internally and not documented.

This is my first module and nearly first python code, so please
critique the style and API that I can learn something.  Thanks.

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This line is completely ham.