Merge pull request inspirehep#398 from drjova/dulwich

setup: fix build issue with setuptools

Sem-Ver: new feature

Merge pull request inspirehep#392 from michamos/add-seminars

seminars: add new schema type

Merge pull request inspirehep#387 from michamos/refs-additional-pubnotes

ReferenceBuilder: handle additional pubnotes

Merge pull request inspirehep#382 from pazembrz/address_fix

conference: change address field to addresses

Merge pull request inspirehep#379 from michamos/add-ror

Add ROR identifiers