function rgbaToHex swap alha chanel

[TimofeyKris]

function rgbaToHex(r, g, b, a) {

            var hex = [
                pad2(convertDecimalToHex(a)),
                pad2(mathRound(r).toString(16)),
                pad2(mathRound(g).toString(16)),
                pad2(mathRound(b).toString(16))
            ];

            return hex.join("");
        }

Change To:

function rgbaToHex(r, g, b, a) {

            var hex = [                
                pad2(mathRound(r).toString(16)),
                pad2(mathRound(g).toString(16)),
                pad2(mathRound(b).toString(16)),
                pad2(convertDecimalToHex(a))
            ];

            return hex.join("");
        }