Changed some Widget subclasses to be consistent about how they handle the...

Changed some Widget subclasses to be consistent about how they handle the passed in 'attrs' parameter. We now always copy it (by calling the parent's __init__).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6451 bcc190cf-cafb-0310-a4f2-bffc1f526a37