Unmarshalling cyclic objects crashes the interpreter

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To test this, simply evaluate process, which seems to be cyclic in Node 0.10.25.

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This might need to be fixed by extending the domain and introducing another type of values, the "native objects". This is because unmarshalling native objects into Lambda objects every time a field is accessed is not the best solution, the evaluation of the field access node should require O(1) time.

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This needs to be readdressed, see #48.

[71104]

This has been readdressed in #48, but the new solution doesn't completely fix arrays.

Example of a valid JavaScript array that cannot be unmarshaled (an exception is thrown in Lambda):

var x = [];
x.push(x);