Validation is not a monad

[puffnfresh]

If validation were a monad, the following two expressions would be equal:

x.map(function(a) {
  return function(b) {
    return [a, b];
  };
}).ap(y);

x.chain(function(a) {
  return y.map(function(b) {
    return [a, b];
  });
});

It's not possible to make those be equal in the case that both x and y are failures.

The project should also be renamed to something like applicative.validation to avoid further confusion.

[puffnfresh]

Woo! Thanks 👍