Remove duplicate __cmp__ method.

Author: GraylinKim

sc2reader/data/__init__.py

@@ -289,18 +289,6 @@ def __hash__(self):
     def __repr__(self):
         return str(self)
 
-    def __cmp__(self, other):
-        if other.id > self.id:
-            return -1
-        elif other.id < self.id:
-            return 1
-        else:
-            if other.type > self.type:
-                return -1
-            elif other.type < self.type:
-                return 1
-            else:
-                return 0
 
 class Ability(object):
     pass