Reclassify memory of Dynamic2TfT

This strategy makes use of the cooperation count. It, thus does ont have
memory 2.

Author: drvinceknight

axelrod/strategies/titfortat.py

@@ -114,7 +114,7 @@ class DynamicTwoTitsForTat(Player):
 
     name = 'Dynamic Two Tits For Tat'
     classifier = {
-        'memory_depth': 2,  # Long memory, memory-2
+        'memory_depth': float("inf"),
         'stochastic': True,
         'makes_use_of': set(),
         'long_run_time': False,
@@ -127,7 +127,7 @@ class DynamicTwoTitsForTat(Player):
     def strategy(opponent):
         # First move
         if not opponent.history:
-            # Make sure we cooporate first turn
+            # Make sure we cooperate first turn
             return C
         if D in opponent.history[-2:]:
             # Probability of cooperating regardless

axelrod/tests/strategies/test_titfortat.py

@@ -124,7 +124,7 @@ class TestDynamicTwoTitsForTat(TestPlayer):
     name = 'Dynamic Two Tits For Tat'
     player = axelrod.DynamicTwoTitsForTat
     expected_classifier = {
-        'memory_depth': 2,
+        'memory_depth': float("inf"),
         'stochastic': True,
         'makes_use_of': set(),
         'inspects_source': False,