support loose compararison between request and entry

add loose check option.

when set this option `true`, entry requirement and request query / body are compared loose or return `true`, if request includes entry.

e.g.

```javascript
console.log(entry.query); // {require1: 1, require2: 2}

console.log(req.query); // {require1: 1, require2: 2, optional: 3} 
check.query(entry.query, req.query, false); // => true

console.log(req.query); // {require1: 1, optional: 3} 
check.query(entry.query, req.query, false); // => false cause `req.query` lacks `require2`
```