[#6759] Gracefully handle HTTP errors when importing GC tickets

GC will sometimes list tickets that actually 404 when you try to view
them.  Nothing we can do about that but log it and keep going.

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#6759] Allow full project URL for GC import

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#6759] Only catch 404 errors when importing GC tickets

Signed-off-by: Cory Johns <cjohns@slashdotmedia.com>
[#6759] bump google code wiki version