Python 3 Compatibility (#208)

* make python3 compatible; clean up test reqs a bit

domdiv/tests/carddb_tests.py

@@ -104,4 +104,4 @@ def test_languagetool_run(pytestconfig):
             out = subprocess.check_output(cmd.split(), stderr=subprocess.STDOUT)
         except subprocess.CalledProcessError as e:
             assert e.output == ''
-        assert out == ''
+        assert out.decode('utf-8') == ''

domdiv/tests/codestyle_tests.py

@@ -1,10 +0,0 @@
-import glob
-
-import pycodestyle
-
-
-def test_conformance():
-    """Test that we conform to PEP-8."""
-    style = pycodestyle.StyleGuide(max_line_length=120)
-    result = style.check_files(glob.glob('*.py') + glob.glob('domdiv/*.py') + glob.glob('tests/*.py'))
-    assert result.total_errors == 0, "Found code style errors (and warnings)."