Generator\Integer

Generates an integer between `PHP_INT_MIN` and `PHP_INT_MAX` and shrinks linearly towards 0.
I have tried it now but after some runs it returns a float. It is less easy then it seems. 
What about [this](http://php.net/manual/en/refs.math.php), I have seen some interesting things about normal distributions but there is no documentation at all. :-/
Let's talk tomorrow at the office.