Add a moo -> google calculator integration

I'm not sure about the vishnu player class integration, but the calculator bit works; try stuff like:

$ python GoogleCalculator.py "100 GBP in EUR"
100 British pounds = 117.143478 Euros

$ python GoogleCalculator.py "(25 / 6) * 5 ^ 7"
(25 / 6) * (5^7) = 325 520.833