Adding Support For MK updates

  - There are some /svc endpoints:
    - /svc/mkupdates (GET): Gets a list of updates and their details
    - /svc/mkupdates (POST): Can post a JSON array of md5s and will return
      only the updates whos md5s are not in the submitted list.
    - /svc/mkupdates/:update.tar.gz (GET): Get the tar file for the
      update