When applying rule to a class, custom messages applied only to first element

## Your environment
* Version of `jquery-validate`: Master
* Browser name and version: Firefox

## Current behavior
When aplying a rule to $(".myclass") it is only applied to the first element.
## Expected behavior
When selecting a class, rule should be applied to all elements of the class.
## Live demo 
https://jsbin.com/lozamas/edit?html,console,output

I also codded a unit test when trying to find a solution:
```html
	<form id="testForm29" class="testttt">
	<div>
		<input type="text" name="form29field1" id="form29field1" class="required-field-custom-message">
	</div>
	<div>
		<input type="text" name="form29field2" id="form29field2" class="required-field-custom-message">
	</div>
	<div>
		<input type="text" name="form29field0" id="form29field0">
	</div>
	</form>
```
```js
QUnit.test( "add rule to class with custom messages", function( assert ) {
	assert.expect( 3 );
	var form = $( "#testForm29" );
	var v = form.validate();

	$( "#form29field0" ).rules( "add", {
		required: true,
		messages: {
			required: "Custom message"
		}
	} );

	$( ".required-field-custom-message" ).rules( "add", {
		required: true,
		messages: {
			required: "Custom message"
		}
	} );

	v.form();

	var label1 = $( "#form29field1" ).next( ".error:not(input)" ).text();
	assert.equal( label1, "Custom message" );

	var label2 = $( "#form29field2" ).next( ".error:not(input)" ).text();
	assert.equal( label2, "Custom message" );

	var label0 = $( "#form29field0" ).next( ".error:not(input)" ).text();
	assert.equal( label0, "Custom message" );

} );

```

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