Make sure requests to OCLC for FAST time out

[jrochkind]

Apparently the OCLC endpoint is timing out -- our app seems to wait 30 seconds for a response, which holds up the puma workers, and eventually at 30 seconds gets reported as an error by heroku.

The connection should have a timeout set to, say, 5s, so it gives up without waiting forever.

This may require making a change to the questioning_authority gem.

Oct 25 19:12:41 scihist-digicoll-production heroku/router at=error code=H12 desc="Request timeout" method=GET path="/authorities/search/assign_fast/all?q=United%20States.%20Patent%20%20Office" host=digital.sciencehistory.org request_id=a1506fd1-187b-4196-8fb4-291657a9c145 fwd="173.161.142.5" dyno=web.1 connect=0ms service=30001ms status=503 bytes=0 protocol=https