Fixed small things found in PR

Author: bpross

gdax/exceptions.py

@@ -23,7 +23,6 @@ def message(self):
     def message(self, message):
         self._message = message
 
-
     @property
     def code(self):
         return self._code

gdax/public_client.py

@@ -54,7 +54,7 @@ def _determine_response(self, response):
         """
         Determines if GDAX response is success or error
         If success, returns response json
-        If error, raises appropiate GdaxException
+        If error, raises appropriate GdaxException
         """
         if self._is_http_success(response.status_code):
             return response.json()