Merge pull request #31 from e-max/count_offset_zrangebyscore_bug

possibility to set offset=0 in zrangebyscore

txredisapi.py

@@ -972,7 +972,7 @@ def _zrangebyscore(self, key, min, max, withscores, offset, count, rev):
             pieces = [cmd, key, min, max, "WITHSCORES"]
         else:
             pieces = [cmd, key, min, max]
-        if offset and count:
+        if offset is not None and count is not None:
             pieces.extend(("LIMIT", offset, count))
         r = self.execute_command(*pieces)
         if withscores: