Add ALLC and ALLD, Defector sources.

Author: drvinceknight

axelrod/strategies/cooperator.py

@@ -10,6 +10,7 @@ class Cooperator(Player):
     Names:
 
     - Cooperator: [Axelrod1984]_
+    - ALLC: [Press2012]_
     """
 
     name = 'Cooperator'

axelrod/strategies/defector.py

@@ -5,7 +5,13 @@
 
 
 class Defector(Player):
-    """A player who only ever defects."""
+    """A player who only ever defects.
+
+    Names:
+
+    - Defector: [Axelrod1984]_
+    - ALLD: [Press2012]_
+    """
 
     name = 'Defector'
     classifier = {