Upgraded vendored Python dependencies to the latest versions and removed the unused dependencies.

libs/dateutil/_common.py

@@ -2,6 +2,7 @@
 Common code used in multiple modules.
 """
 
+
 class weekday(object):
     __slots__ = ["weekday", "n"]
 
@@ -23,7 +24,14 @@ class weekday(object):
             return False
         return True
 
-    __hash__ = None
+    def __hash__(self):
+        return hash((
+          self.weekday,
+          self.n,
+        ))
+
+    def __ne__(self, other):
+        return not (self == other)
 
     def __repr__(self):
         s = ("MO", "TU", "WE", "TH", "FR", "SA", "SU")[self.weekday]
@@ -31,3 +39,5 @@ class weekday(object):
             return s
         else:
             return "%s(%+d)" % (s, self.n)
+
+# vim:ts=4:sw=4:et