Change "Audience" claim to List instead of Array

[Justin Richer]

The Audience claim should use Java Collections instead of arrays. A java.util.List object is likely the best candidate for this interface.

[Vladimir Dzhuvinov]

Makes sense. I suppose items will be one or few, and there would be no need to modify the list once created, so an ArrayList should be a good fit.

[Justin Richer]

OK, I'll patch this one, then.

[Vladimir Dzhuvinov]

Thanks Justin. I wasn't able to to look at the GCM crypto stuff today, but hopefully soon :)

[Justin Richer]

changed audience claim from Array to List, closes #15

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