fix for issue 2610:  - add recovery installer config file (which invokes chromeos-install with    --recovery flag)  - update build_image to install recovery_installer pkg and changed base image    name to recovery_image.bin
fix for issue 2610:
 - add recovery installer config file (which invokes chromeos-install with
   --recovery flag)
 - update build_image to install recovery_installer pkg and changed base image
   name to recovery_image.bin

Review URL: http://codereview.chromium.org/2081018

joshfire/chromiumos-platform-init