Support binding of form input name

[mike-spainhower]

Currently if you try something like

<form name='myForm'>
    <input type='text' name='{{varInScope}}'></input>
</form>

then the errors and other values are placed on $scope.myForm['{{varInScope}}'] rather than $scope.myForm['']

Having something like ng-name that added support for this would be immensely useful for dynamic generation of forms (e.g., with inputs under an ng-repeat).

[lgalfaso]

Have you looked at #3135?

[mike-spainhower]

Redundant, thanks!