Logout functionality for IISCosign

[jarod@xxxxxxxxx]

I just finished writing an ISAPI extension DLL to complement the IISCosign 
filter. It implements logout functionality for IISCosign.  It deletes the 
user's service cookie and redirects them to a logout URL that is specified 
in the cosign.dll.config file. Just add a new item in your config file:

<LogoutURL>https://weblogin.umich.edu/cgi-bin/logout<LogoutURL/>


To redirect the user after logout just link to the dll as follows:

<a href="/cosignlogout.dll?http://service.umich.edu/welcome.html";>Logout</a>


After logging out, the user will be redirected to 
http://service.umich.edu/welcome.html.

Consider this in 'beta testing' for now.  Assuming no show-stopping bugs 
come up, it will be included with the IISCosign 1.1.0 release.  Please let 
me know what you think!

You can grab the dll here: 
<http://cowboybebop.staff.itd.umich.edu/iiscosign/>.

--Jarod Malestein