Bug with negative input AND solution

[Holonist]

Hi, first of all thank you for this class, it is truly amazing.
I use it to generate the world for my game.

Problem:
When x or y or both are negative values, the output of the nosie2D function becomes very weird and fragmented.

Solution:
In public function interpolatedNoise($x, $y)
change lines 102 and 105 like this:
102: $integerX = (int) floor($x);
205: $integerY = (int) floor($y);

The floor() function did the trick here. Positive values remain unchanged in my tests, while negative values now produce the same nice results!

Cheers, Holo