Pre-release fixes. Mac build and keychain fixes.

- fixed signing process for mac os builds
- removed one-click sign-in option for google
  services
- updated chat popups so they won't scroll to last
  received message if user scrolled up before
- beta - fix for double messages again
- minor changes to keystone_glue and
  app-Info.plist - should be in effect if only
  building isohunt.com version - TODO: automate