v1.5.6

CHANGELOG

• Add [#212]: Set year from 'ex' authorship as a year of a name.
  Add 'ex' authors to list of all authors.

• Add [#211]: PR [#214] by @tobymarsden, general approach for non-...
  specific epithets.

• Add [#208]: PR [#210] by @tobymarsden, option to preserve diaereses.

• Fix [#213]: Stop generating space between Mc, Mac and the rest of an
  an author name.