Version 2.2.2

Security related fixes:

• Integer Overflow in gdImagePaletteToTrueColor() resulting in heap overflow (CVE-2016-5767)
• Stack overflow with gdImageFillToBorder (CVE-2015-8874)
• Integer Overflow in _gd2GetHeader() resulting in heap overflow (CVE-2016-5766)
• NULL Pointer Dereference at _gdScaleVert
• Integer Overflow in gdImagePaletteToTrueColor() in heap overflow

Numerous other fixes have been applied. The scale and rotation functions have been greatly improved as well.