Adding 'hasAttribute' method

[garry.yao]

There's some cases where it's necessary to check whether a attributed is intrinsic OR assigned dynamically on an element.

[garry.yao]

Much of our dialog fields play the role of the getter/setter of the DOM element node attribute, and we always use the following way to check the existence of a specified attribute:

if( element.getAttribute( 'maxLength' ) )
  // Assign the value to dialog fields

It works in most cases but has one problem:

• Some attribute like 'maxLength' and 'size' has their inital value in IE, which we want to ignore instead of taking them, see #3008 for a concrete example of this.

[martinkou]

This removes the ieDefaults hacks in the forms plugin cleanly.

[garry.yao]

The new method doesn't cover certain special attributes in sense of the attached TC in IE.

[martinkou]

I'm not sure if this is worth it - the core code size is being increased to check for fringe cases. But anyway this should pass the tests.

[fredck]

You are right Martin, we don't need it by default into the core.

Let's proceed in this way... let's have a basic implementation in the core and then override it inside the forms plugin, for IE only.

[martinkou]

Fixed with [3438].

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