add pep8-tests

.pep8

@@ -0,0 +1,2 @@
+[pep8]
+ignore = E501

tests/test_style.py

@@ -0,0 +1,8 @@
+import pep8
+
+
+def test_pep8_comformance():
+    ''' Test that the code conforms to PEP8 '''
+    pep8style = pep8.StyleGuide(config_file='.pep8')
+    result = pep8style.check_files(['tsstats.py', 'tests/test_config.py', 'tests/test_general.py', 'tests/test_style.py'])
+    assert result.total_errors == 0