Loading any kind of tape and different state_tables from outside the class

[chrisnp]

Consider adding an eternal loader, so that, the initialization of the SimpleTuringMachine class, at:

def __init__(self): self.tape = ["B", "B", "B", "B"] et.c.

to not be so hardcoded.

Maybe load a tape and a state_table from a file? Or a stream?