[web2py] cPickle with protocol 2 on a storage object fails

[marius.v.niekerk]

When using pickle with protocol 2 pickling a Storage object fails

This is caused by the __getattr__ getting called to find the 
__getinitargs__ and __getnewargs__ methods.  They dont exist in the 
dictionary so consequently they return None.  Pickle then calls the None 
and consequently dies.

Implementing these methods in gluon.storage.Storage makes things all better

    def __getinitargs__(self):
        return ()

    def __getnewargs__(self):
        return ()

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