update to 0.59
    
    0.59:
    - mostly documentation updates
    
    0.58:
    - add a "dogtag-ipa-renew-agent" CA so that we can renew certificates using
      an IPA server's internal Dogtag instance
    - export the requested profile and old certificate to enrollment helpers
    - make libxml and libcurl into hard build-time requirements
    - serialize all pre/save/post sequences to make sure that stop/save/start
      doesn't become stop1/save1/stop2/start1/save2/start2 when we're stopping
      a service while we muck with more than one of its certificates
    - add a command option (-T) to getcert for specifying which enrollment
      profile to tell a CA that we're using, in case it cares (#10)
    
    0.57
    - clarify that the command passed to getcert -C is a "post"-save command
    - add a "pre"-save command option to getcert, specified with the -B flag (#9)