Merge pull request #342 from basho/gh286

Export configure_sink/2 for runtime sink config

Reviewed-by: macintux

src/lager_app.erl

@@ -28,6 +28,7 @@
 -export([start/0,
          start/2,
          start_handler/3,
+         configure_sink/2,
          stop/1]).
 
 %% The `application:get_env/3` compatibility wrapper is useful