Point: Return the curve point instead of instantiating each time

lib/crypto/point.js

@@ -49,7 +49,7 @@ Point.fromX = function fromX(odd, x){
  * @returns {Point} An instance of the base point.
  */
 Point.getG = function getG() {
-  return Point(ec.curve.g.getX(), ec.curve.g.getY());
+  return ec.curve.g;
 };
 
 /**