Object rotation from corrner 

I have implemented object rotation from corner, please look on that.

//disable standard obect Rotation
fabric.Object.prototype.hasRotatingPoint = false;

//new Fabric Object Properties
fabric.Object.prototype.hasCornerRotatingPoint = true;
fabric.Object.prototype.cornerRotationSize = 7;
fabric.Object.prototype.cornerRotating = 'tr'; // tr, tl, bl, br, ml, mt, mb, mr
fabric.Object.prototype.cornerRotatingPointOffset = 4;