Added api error handeling and updated docs

indicoio/text/lang.py

@@ -28,4 +28,8 @@ def language(text):
     
     data_dict = json.dumps({'text': text})
     response = requests.post("http://api.indico.io/language", data=data_dict, headers=JSON_HEADERS)
-    return json.loads(response.content)
+    response_dict = response.json()
+    if len(response_dict) < 2:
+      raise ValueError(response_dict.values()[0])
+    else:
+      return response_dict