Homework:
---------
In classs you learned about IIFE's, encapsulation and object oriented programming.
You also worked on a example calling library_a.render() and library_b.render().

IIFE's are good for grouping related code in a namespace. Let's say that you have some math related functions . Then
you could do:

var Math = (function () {
    return {
        Rectangle: function (height, width) {
            return {
               calcArea: function () {
                 return height*width;
               }
            };
        },
        Triangle: function (A, B, C) {
           // .. insert code here ...
        }
    };
})();

var rectangle = new Math.Rectangle(10,10);
console.log(rectangle.calcArea());
var triangle = new Math.Triangle(6,8,10);
//console.log(triangle.calcArea());

Your task: insert code into the Math.Triangle class that
will make console.log(triangle.calcArea()) print out the area of a triangle