No more import side effects for monkey patches.

commonware/response/cookies/models.py

@@ -1,2 +1,5 @@
 # Import monkeypatch code at startup.
-import commonware.response.cookies.monkeypatch
+from commonware.response.cookies.monkeypatch import patch_all
+
+
+patch_all()

commonware/response/cookies/monkeypatch.py

@@ -55,4 +55,6 @@ def set_cookie_secure(f):
         return r
     return wrapped
 
-HttpResponse.set_cookie = set_cookie_secure(HttpResponse.set_cookie)
+
+def patch_all():
+    HttpResponse.set_cookie = set_cookie_secure(HttpResponse.set_cookie)

commonware/response/cookies/tests.py

@@ -2,7 +2,10 @@ from django.http import HttpResponse
 from mock import patch
 from nose.tools import eq_
 
-import commonware.response.cookies.monkeypatch
+from commonware.response.cookies.monkeypatch import patch_all
+
+
+patch_all()
 
 
 def test_secure_cookies():