Reverse binary operator overload

Use case - multiply double to Complex:

```
Complex a = new Complex(1.2, 2.3)
1.2*a
```

We can't add method `multiply` to double.

Solution:
add method `Complex#multiplyRev(double)`
This method will be used on second operand in cases where is no multiply method in left operand.
So: `1.2 * a` will be transformed to `a.multiplyRev(1.2)`
This should work for every binary operator.
