Add user_id to system hook when new user created

app/services/system_hooks_service.rb

@@ -36,7 +36,8 @@ class SystemHooksService
     when User
       data.merge!({
         name: model.name,
-        email: model.email
+        email: model.email,
+        user_id: model.id
       })
     when UsersProject
       data.merge!({

spec/services/system_hooks_service_spec.rb

@@ -7,7 +7,7 @@ describe SystemHooksService do
 
   context 'it should build event data' do
     it 'should build event data for user' do
-      SystemHooksService.build_event_data(user, :create).should include(:event_name, :name, :created_at, :email)
+      SystemHooksService.build_event_data(user, :create).should include(:event_name, :name, :created_at, :email, :user_id)
     end
 
     it 'should build event data for project' do