Provide API to access NWBib data

Closes #117. Deployed for testing to http://staging.api.lobid.org/

This adds API to access NWBib data: http://staging.api.lobid.org/resource?set=NWBib&format=page

The main page has been restructured: remove endpoint-specific parameters from the main table and set up a table for the `/resource` parameters (`author`, `subject`, `set`).

This also adds a little sample application to download all NWBib data, paging through the results (in `lodmill-ui/test/tests/SampleUsage.java`).