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Update metrics. R#13

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Update metrics. R#13
theiling wants to merge 1 commit intobenhamner:masterfrom
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@theiling theiling commented Jun 7, 2015

Corrected rare case, where metrics fails and gives "NaN"..
Happens in case of perfect match and both expected.mat and confusion.mat only have one nonzero entry.
(Example where the metric fails:
rater.a = c(2, 2, 2, 2, 2, 2)
rater.b = c(2, 2, 2, 2, 2, 2))
Help by Stephen McInerney in Kaggle forum

Corrected rare case, where metrics fails and gives "NaN"..
Happens in case of perfect match and  both expected.mat and confusion.mat only have one nonzero entry.
(Example where the metric fails:
rater.a = c(2, 2, 2, 2, 2, 2)
rater.b = c(2, 2, 2, 2, 2, 2))
Help by Stephen McInerney   in Kaggle forum
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