[1.0.X] Fixed #9890 -- Modified the regex validation for email addresses to...

[1.0.X] Fixed #9890 -- Modified the regex validation for email addresses to match RFC822/1035. Thanks to ozgur for the report, and kratorius for the patch.

Merge of 10573 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10576 bcc190cf-cafb-0310-a4f2-bffc1f526a37