Try to decode bytestrings from UTF8 in json_safe

Closes #148

httpbin/helpers.py

@@ -77,6 +77,7 @@ def json_safe(string, content_type='application/octet-stream'):
     URL scheme was chosen for its simplicity.
     """
     try:
+        string = string.decode('utf-8')
         _encoded = json.dumps(string)
         return string
     except (ValueError, TypeError):
@@ -152,7 +153,6 @@ def get_dict(*keys, **extras):
     _keys = ('url', 'args', 'form', 'data', 'origin', 'headers', 'files', 'json')
 
     assert all(map(_keys.__contains__, keys))
-
     data = request.data
     form = request.form
     form = semiflatten(request.form)

test_httpbin.py

@@ -47,6 +47,10 @@ class HttpbinTestCase(unittest.TestCase):
             response = self.app.post('/post', data={"file": f.read()})
         self.assertEqual(response.status_code, 200)
 
+    def test_post_body_unicode(self):
+        response = self.app.post('/post', data=u'оживлённым'.encode('utf-8'))
+        self.assertEqual(json.loads(response.data.decode('utf-8'))['data'], u'оживлённым')
+
     def test_post_file_with_missing_content_type_header(self):
         # I built up the form data manually here because I couldn't find a way
         # to convince the werkzeug test client to send files without the