Add ext_server_kiwi, which is Mimikatz v2

This is a separate extension because the new version doesn't support
as many operating systems as the old version, but it does have more
new features which are really funky.
Merge branch 'upstream/master' into ext_server_kiwi
Add CVE-2013-0634: Adobe Flash Player 11.5 memory corruption
Fix bugs
Merge branch 'upstream/master' into ext_server_kiwi
Add lsa secret dumps plus other tweaks
Merge branch 'upstream/master' into ext_server_kiwi
Add SAM key dump in LSA dumping output
Add support for kerberos ticket enumeration

Fix up a bunch of other issues and do some code tidies too.
Add comments to the kiwi source
Fix silly typo
Bit more code tidying
Code tidying and defaulting to empty strings for table format
Final bits of documentation and code tweaking
Fix typo in kiwi help
Modify the menu item descriptions
Update to use Rex::Text and change handling a bit

This change also outputs blank creds so that users know which
accounts have blank passwords
SSH user enumeration script
Add CVE 2006-5229 reference
Update to match meterpreter changes

This also includes the ability to specify id and groups for the
golden ticket feature.