Remove username attribute

wise-webapp/src/main/java/com/wisemapping/service/MindmapServiceImpl.java

@@ -137,8 +137,7 @@ public class MindmapServiceImpl
         }
 
         final Calendar creationTime = Calendar.getInstance();
-        final String username = user.getUsername();
-        map.setLastModifierUser(username);
+        map.setLastEditor(user);
         map.setCreationTime(creationTime);
         map.setLastModificationTime(creationTime);
         map.setCreator(user);

wise-webapp/src/main/java/com/wisemapping/service/UserService.java

@@ -34,8 +34,6 @@ public interface UserService {
 
     public User getUserBy(long id);
 
-    public User getUserByUsername(String username);
-
     public void updateUser(User user);
 
     public void resetPassword(@NotNull String email) throws InvalidUserEmailException;

wise-webapp/src/main/java/com/wisemapping/service/UserServiceImpl.java

@@ -176,11 +176,6 @@ public class UserServiceImpl
         return userManager.getUserBy(email);
     }
 
-    @Override
-    public User getUserByUsername(String username) {
-        return userManager.getUserByUsername(username);
-    }
-
     @Override
     public User getUserBy(long id) {
         return userManager.getUserBy(id);