Handle generics of real numbers

The generation of asserts for generics does not handle reals (Double or Float) as expected: Double/Float are processed as Objects, while they should be processed as reals.
Ex:

``` java
class Of {
T value;
}
class OfDouble extends Of {
}
```

Actual result:

``` java
class OfDoubleAssert extends AbstractAssert {
public OfDoubleAssert hasValue(Comparable avg) {
...
}
}
```

Expected result:

``` java
class OfDoubleAssert extends AbstractAssert {
public OfDoubleAssert hasValue(Comparable avg) {
...
}

public Double hasValueCloseTo(Double value, Double offset) {
...
}

}
```

Thanks !