remove empty files from sponsors app

sponsors/admin.py

@@ -1,3 +0,0 @@
-from django.contrib import admin
-
-# Register your models here.

sponsors/models.py

@@ -1,5 +0,0 @@
-from __future__ import unicode_literals
-
-from django.db import models
-
-# Create your models here.

sponsors/tests.py

@@ -1,3 +0,0 @@
-from django.test import TestCase
-
-# Create your tests here.