merge with stable

merge with stable

--- a/mercurial/statichttprepo.py	Fri Jun 01 11:15:00 2012 -0300
+++ b/mercurial/statichttprepo.py	Tue Jun 12 16:20:38 2012 -0500
@@ -26,7 +26,8 @@
         end = ''
         if bytes:
             end = self.pos + bytes - 1
-        req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
+        if self.pos or end:
+            req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
 
         try:
             f = self.opener.open(req)