Disabling contracts can now be done directly rather than through Tracker construction

Author: fblundun

snowplow_tracker/__init__.py

@@ -2,3 +2,4 @@
 from snowplow_tracker.subject import Subject
 from snowplow_tracker.consumer import Consumer, AsyncConsumer, CeleryConsumer, RedisConsumer
 from snowplow_tracker.tracker import Tracker
+from contracts import disable_all, enable_all

snowplow_tracker/tracker.py

@@ -58,7 +58,7 @@ class Tracker:
     @contract
     def __init__(self, out_queue, _subject=None,
                  namespace=None, app_id=None, context_vendor=None, encode_base64=DEFAULT_ENCODE_BASE64, 
-                 contracts=True, log=True):
+                 contracts=True):
         """
             :param out_queue:        Consumer to which events will be sent
             :type  out_queue:        consumer
@@ -74,15 +74,10 @@ def __init__(self, out_queue, _subject=None,
             :type  encode_base64:    bool
             :param contracts:        Whether to enable contracts
             :type  contracts:        bool
-            :param log:              Whether to enable Python logging
-            :type  log:              bool
         """
         if not contracts:
             disable_all()
 
-        if not log:
-            logger.setLevel(logging.CRITICAL)
-
         if _subject is None:
             _subject = subject.Subject()