Add MS IE8 DoL 0day exploit (CVE-2013-1347)

This module exploits a use-after-free vuln in IE 8, used in the
Department of Labor attack.
Land #1797, IE8 DoL exploit module from @wchen-r7

Exploit for an in-the-wild unpatched vuln in IE8. @jvazquez-r7 already
reviewed functionality
Fix disclosure date, ref for #1897