Remove Http Server Content Length Restriction (#138)

* Lift restrictions on the Akka HTTP server content-length in the default config.

* Update config.conf

Reference: https://doc.akka.io/docs/akka-http/current/configuration.html

Author: vjkoskela

config/config.conf

@@ -28,5 +28,10 @@ akkaConfiguration {
     stdout-loglevel="DEBUG"
     logging-filter="akka.event.slf4j.Slf4jLoggingFilter"
     actor.debug.unhandled="on"
+    
+    # MAD is effectively a single client service and so a client sending large payloads is
+    # only going to impact its own ability to accept and aggregate samples. However, if you
+    # have misbehaving clients or running a multi-tenant setup, you can rachet this down.
+    http.server.parsing.max-content-length="infinite"
   }
 }