gnome-keyring branched for 2.18 work

[Nate Nielsen <nielsen-list memberwebs com>]

gnome-keyring has been branched for 2.18 work. The 2.16 branch is
"gnome-2-16".

Plans for 2.18 include:

 * A method by which to access meta data about secrets (display name,
   description, etc...) without incurring the ACL prompt.
 * Application private secrets. Stored in the same keyring but only
   ever visible or accessible by one application.

Cheers,
Nate Nielsen