bump up versions in test_requirements.txt

test_requirements.txt

@@ -4,8 +4,8 @@ astroid==1.3.6
 django_nose
 nose==1.3.3
 httpretty==0.8.0
-pep8==1.5.7
-pylint==1.2.1
+pep8==1.6.2
+pylint==1.4.1
 pep257==0.3.2
 mock==1.0.1
 testfixtures==4.0.0