Suggest keyring dependencies

apm now gracefully fails without them being installed and they
are only used for publishing and starring packages.

resources/linux/debian/control.in

@@ -1,6 +1,7 @@
 Package: <%= name %>
 Version: <%= version %>
-Depends: gconf2, gconf-service, libgtk2.0-0, libudev0 | libudev1, libgcrypt11, libgnome-keyring0, gir1.2-gnomekeyring-1.0, libnotify4, libxtst6, libnss3, python, gvfs-bin, xdg-utils
+Depends: gconf2, gconf-service, libgtk2.0-0, libudev0 | libudev1, libgcrypt11, libnotify4, libxtst6, libnss3, python, gvfs-bin, xdg-utils
+Suggests: libgnome-keyring0, gir1.2-gnomekeyring-1.0
 Section: <%= section %>
 Priority: optional
 Architecture: <%= arch %>