Assert::greaterThanEq and Assert::lessThanEq don't work for NAN

[johanvio]

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Hi,

I think I just found a bug in your assertion library

$a = NAN; // not-a-number
Assert::greaterThanEq($a, 0);  // does not throw, while it should
Assert::lessThanEq($a, 0); // does not throw, while it should

eq seems to work fine with NAN:

$a = NAN;
Assert::eq($a, $a); // throws, which is fine

Thank you for your nice assertion library; I've been using it for years, and I like it very much!