title: django loading fixtures fails on unicode data
body: <p>I saved a bunch of fixtures via dumpdata, here is an example:</p>
  
  <pre><code>[
    {
      "pk": 1,
      "model": "core.question",
      "fields": {
        "text": "\u041a\u0430\u043a\u0438\u0445 \u0436\u0438\u0432\u043e\u0442\u043d\u044b\u0445 \u0432\u044b \u0434\u0435\u0440\u0436\u0438\u0442\u0435 \u0434\u043e\u043c\u0430",
        "is_free_text": false
      }
    },
    {
      "pk": 2,
      "model": "core.question",
      "fields": {
        "text": "\u0415\u0434\u0438\u0442\u0435 \u043b\u0438 \u0432\u044b \u043c\u044f\u0441\u043e?",
        "is_free_text": false
      }
    },
    {
      "pk": 3,
      "model": "core.question",
      "fields": {
        "text": "\u041a\u0430\u043a\u043e\u0439 \u0435\u043d\u043e\u0442 \u0436\u0438\u0432\u0435\u0442 \u0443 \u0432\u0430\u0441 \u0434\u043e\u043c\u0430",
        "is_free_text": false
      }
    }
  ]
  </code></pre>
  
  <p>when I do </p>
  
  <blockquote>
    <p>manage.py loaddata core_question.json</p>
  </blockquote>
  
  <p>, the following error comes up:</p>
  
  <blockquote>
    <p>Warning: Incorrect string value: '\xD0\x94\xD0\xB8\xD0\xB0...' for
    column 'first_name' at row 1</p>
  </blockquote>
  
  <p>I though it could be the database thing but it all seems to be unicode:</p>
  
  <pre><code>character_set_client,utf8
  character_set_connection,utf8
  character_set_database,utf8
  character_set_filesystem,binary
  character_set_results,utf8
  character_set_server,utf8
  character_set_system,utf8
  character_sets_dir,/usr/share/mysql/charsets/
  </code></pre>
  
  <p>as well as the schema collation:</p>
  
  <blockquote>
    <p>CATALOG_NAME,SCHEMA_NAME,DEFAULT_CHARACTER_SET_NAME,DEFAULT_COLLATION_NAME,SQL_PATH
    NULL,reviewer,utf8,utf8_general_ci,NULL</p>
  </blockquote>
  
  <p>is there something else I'm missing?</p>