Do now use epsilong for AssertEquals

With the current implementation, ``assertEquals`` and ``assertEqualsEpsilon`` use epsilon which means that both ``testA`` and ``testB`` will succeed:

```javascript
TestCase.subclass('EpsilonTest', {
    epsilon: 1,
    testA: function() { this.assertEquals(1,2); },
    testB: function() { this.assertEqualsEpsilon(1,2); }
});
var test = new EpsilonTest()
test.runAll();
// [TestResult Tests run: 2 -- Tests failed: 0 -- Time: 0.002s]
```