Metrics covering reproducibility

#1

From @suenjedt on Thu Aug 09 2018 09:04:46 GMT+0000 (UTC)

As a service provider, I would like to show the statistics of successful reuse/rerun of a physics analysis. This should also be included in the H index.

Related to https://github.com/datacite/freya/issues/53

Copied from original issue: https://github.com/datacite/freya/issues/54