Efficiency tests

  		•  The exec used in the __call__ method is slow!

  		• Think of a hardcoded function, 
    def f1(x):
    return sin(x) + x**3 + 2*x
    and the corresponding StringFunction-like objects

  		• Efficiency test (time units to the right): 
    f1               :  1
StringFunction_v1: 13
StringFunction_v2:  2.3
StringFunction_v3: 22
    Why?

  		• eval w/compile is important; exec is very slow

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