Support combination of different query parameters

See https://github.com/lobid/lodmill/issues/356

Deployed to staging: http://test.lobid.org/api

Sample queries:

http://test.lobid.org/resource?name=Typee&author=118580604
http://test.lobid.org/resource?name=Fahrrad&subject=4031483-2
http://test.lobid.org/resource?author=Abramson&id=9780899502847