[xmlsec] contribution of NSS extensions to your xmlsec library

[Aleksey Sanin]

And after removing "cc" to all big people at AOL, some more details :)
I have checked in your patch almost "as-is" (few minor tweaks to make
API documentation extractor happy). Also I have filed xmlsec bugs
for the rest of functionality that is not implemented yet (also see 
src/nss/README):
      
    http://bugzilla.gnome.org/show_bug.cgi?id=118628
    http://bugzilla.gnome.org/show_bug.cgi?id=118629
    http://bugzilla.gnome.org/show_bug.cgi?id=118630
    http://bugzilla.gnome.org/show_bug.cgi?id=118631
    http://bugzilla.gnome.org/show_bug.cgi?id=118632
    http://bugzilla.gnome.org/show_bug.cgi?id=118633
    http://bugzilla.gnome.org/show_bug.cgi?id=118634
    http://bugzilla.gnome.org/show_bug.cgi?id=118635
    http://bugzilla.gnome.org/show_bug.cgi?id=118636

I would do some testing in next few days and probably earlier next week
there would be 1.1.0 release with all the new stuff :)

Thanks again for your work!
Aleksey