Sum of counts fails on memcached backend because counts are of type str

[pmclanahan]

Using python-memcache and the memcached backend in Django, the return from line 32 is a list of strings. This throws an exception on line 35 when the sum is attempted. I modified line 32 to the following to correct the issue.

counts = [int(x) for x in self.get_counters(request).values()]

[bartTC]

Thank you!