bio-guoda/preston:

• support https://dataone.org as a preston remote inspired by @cboettig @mbjones contributions to https://github.com/cboettig/contentid/blob/master/R/dataone_registry.R . https://github.com/bio-guoda/preston/issues/181 . With this, preston is able to get content by their md5 content id using:

  $ preston cat --algo md5 --remote https://dataone.org hash://md5/e27c99a7f701dab97b7d09c467acf468 
  *******************************************************************************
  *** Historical CO2 Record from the Vostok Ice Core                          ***
  ***                                                                         ***
  *** Source: J.M. Barnola                                                    ***
  ***         D. Raynaud                                                      ***
  ***         C. Lorius                                                       ***
  ***         Laboratoire de Glaciologie et de Geophysique de l'Environnement ***
  ***         38402 Saint Martin d'Heres Cedex, France                        ***
  ***                                                                         ***
  ***         N. I. Barkov                                                    ***
  ***         Arctic and Antarctic Research Institute                         ***
  ***         Beringa Street 38                                               ***
  ***         St. Petersburg 199226, Russia                                   ***
  ***                                                                         ***
  *** January 2003                                                             ***
  *******************************************************************************
                  Mean
         Age of   age of    CO2
  Depth  the ice  the air concentration
   (m)   (yr BP)  (yr BP)  (ppmv)
  
  149.1 5679    2342    284.7
  173.1 6828    3634    272.8
  ...
  3301.4    417638  415434  286.9
  3304.4    419328  417160  277.6
  

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