Added some user message handlers

Handlers now exist for user creation, auth, state messages, and post
messages. Still need to do group permissions and messages

src/db/schema.rs

@@ -35,6 +35,7 @@ diesel::table! {
         client_timestamp -> Int8,
         server_timestamp -> Int8,
         username -> UserT,
+        edited -> Nullable<Bool>,
     }
 }