Add contrib/ui-api-proxy.go for testing UI features with live data.

ui-api-proxy is a reverse http proxy that allows the UI to be served from
a different host than the API. This allows testing new UI features served
from localhost but using live production data.

Change-Id: I1cef74c995ac21f4310c5ced4c042ece59a1a8e8
1 file changed