this.angle=0; //added it in the constructor

this.rotated = false;

Caman.Plugin.register("rotate", function(degrees) {
    //....
    //....
    //....
    this.angle += degrees;
    this.rotated = true;
    return this.replaceCanvas(canvas);
}

else if (this.rotated){
    canvas = document.createElement('canvas');//Canvas for initial state
    canvas.width = this.originalWidth; //give it the original width
    canvas.height = this.originalHeight; //and original height
    ctx = canvas.getContext('2d');
    imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
    pixelData = imageData.data;//get the pixelData (length equal to those of initial canvas
    _ref = this.originalPixelData; //use it as a reference array
    for (i = _i = 0, _len = _ref.length; _i < _len; i = ++_i) {
        pixel = _ref[i];
        pixelData[i] = pixel; //give pixelData the initial pixels
    }
    ctx.putImageData(imageData, 0, 0); //put it back on our canvas
    rotatedCanvas = document.createElement('canvas'); //canvas to rotate from initial
    rotatedCtx = rotatedCanvas.getContext('2d');
    rotatedCanvas.width = this.canvas.width;//Our canvas was already rotated so it has been replaced. Caman's canvas attribute is allready rotated, So use that width
    rotatedCanvas.height = this.canvas.height; //the same
    x = rotatedCanvas.width / 2; //for translating
    y = rotatedCanvas.width / 2; //same
    rotatedCtx.save();
    rotatedCtx.translate(x, y);
    rotatedCtx.rotate(this.angle * Math.PI / 180); //rotation based on the total angle
    rotatedCtx.drawImage(canvas, -canvas.width / 2, -canvas.height / 2, canvas.width, canvas.height); //put the image back on canvas
    rotatedCtx.restore(); //restore it
    pixelData = rotatedCtx.getImageData(0, 0, rotatedCanvas.width, rotatedCanvas.height).data; //get the pixelData back
    width = rotatedCanvas.width; //used for returning the pixels in revert function
}

Caman.prototype.reset = function() {
    //....
    //....
    this.angle = 0;
    this.rotated = false;
}