Add dataset citation info from PLOS DLM api
The Public Library of Science harvests citations from certain 'sources' such as
DataCite and associates these with identifiers from participating repositories, such as DataONE.
A public api is available to access this info: http://dlm.plos.org/api
Update the SearchResults view to include citation count for a dataset from PLOS DML api.
Create a new view "Citations" to contain the text of a citations for a dataset.