Add entries to `parser` table: IEEE, Copernicus, OUPFT

[ehenneken]

The following entries need to be added to the parser table in order to support references in files with extensions .copernicus.xml, .ieee.xml and .oupft.xml.

{'name': 'JATS', 'extension_pattern': '.ieee.xml', 'reference_service_endpoint': '/xml', 'matches': []},
{'name': 'EGU', 'extension_pattern': '.copernicus.xml', 'reference_service_endpoint': '/xml', 'matches': []},
{'name': 'OUPFT', 'extension_pattern': '.oupft.xml', 'reference_service_endpoint': '/xml', 'matches': []},

(the associated parser is listed in the name field)