modify the boq.utils.qs function

now you can add functions that apply to resultant array.
example:
	Boq.utils.qs.adds.foo=function(){
		//in the 'this' you can view the current array
		b.u.debug('foo function called',this);
	}

	b.u.qs('table').foo();
	//you can view the message from the foo function.