Added constructor check

Sometime we need to check only the type of the value. See the below example.

~~~js
deepEqual(
        { a : 'str', b: 10, c: [10, true], d: {k: [1121, 2323], d: Number} },
        { a : String, b: Number, c: [Number, Boolean] , d: {k: Array, d: 10} }
);
~~~