get params on Backboune.Router

**current version**
```url
http://example.com/posts?sort=recent
```
```javascript
var Route = Backbone.Router.extend({
	routes: { "posts": "posts" },
	posts: function (params) { 
		# don't come
		# but backbone.js is come
	}
});
```

**patch version**
```javascript
var Route = Backbone.Router.extend({
	routes: { "posts": "posts" },
	posts: function (params) { 
		console.log("in posts: " + params); # in posts: sort=recent
	}
});
```

all test suits are passed