Use `Operator.OR` for organisations-by-name queries

See #184

Deployed to staging, e.g. http://staging.api.lobid.org/organisation?name=Bundesinstitut+f%C3%BCr+Arzneimittel+und+Medizinprodukte+%28BfArM%29%2C+Abteilung+%E2%80%9EForschung%E2%80%9C%2C+53175+Bonn

Also yields suggestions when pasting "Bundesinstitut für Arzneimittel und Medizinprodukte (BfArM), Abteilung „Forschung“, 53175 Bonn" into the organisations search box on http://staging.api.lobid.org