Make use_list param configurable

It is set up to be converted to lists by default. Django expects row
type to be tuple. Also tuples tend to perform better than lists and
it is good if it can be configurable.

Closes #166

tarantool/connection.py

@@ -93,6 +93,7 @@ def __init__(self, host, port,
                  reconnect_delay=RECONNECT_DELAY,
                  connect_now=True,
                  encoding=ENCODING_DEFAULT,
+                 use_list=True,
                  call_16=False,
                  connection_timeout=CONNECTION_TIMEOUT):
         '''
@@ -132,6 +133,7 @@ def __init__(self, host, port,
         self.connected = False
         self.error = True
         self.encoding = encoding
+        self.use_list = use_list
         self.call_16 = call_16
         self.connection_timeout = connection_timeout
         if connect_now:

tarantool/response.py

@@ -55,8 +55,9 @@ def __init__(self, conn, response):
 
         unpacker_kwargs = dict()
 
-        # Decode msgpack arrays into Python lists (not tuples).
-        unpacker_kwargs['use_list'] = True
+        # Decode msgpack arrays into Python lists by default (not tuples).
+        # Can be configured in the Connection init
+        unpacker_kwargs['use_list'] = conn.use_list
 
         # Use raw=False instead of encoding='utf-8'.
         if msgpack.version >= (0, 5, 2) and conn.encoding == 'utf-8':