Make functions curried

`curry: true` will make all methods curried

``` javascript
var o = Monadic({
foo: function(a, b) {
return a+b;
}
}, {curry: true});
```

so you can do

``` javascript
['Foo', 'Bar', 'Baz'].map(o.foo('Lorem '));
// ==> ['Lorem Foo', 'Lorem Bar', 'Lorem Baz']
```

Curry can be set by default and make it unable when option set to false.