Add User-Agent for request to binhosts.

This is workaround for some AntiDDOS system, without User-Agent they
send HTTP403.

pym/calculate/lib/utils/binhosts.py

@@ -45,6 +45,7 @@ def _urlopen(fn, timeout=None):
     """
     proxy_handler = urllib2.ProxyHandler({})
     opener = urllib2.build_opener(proxy_handler)
+    opener.addheaders = [('User-Agent', 'Calculate Linux')]
     if timeout is not None:
         f = opener.open(fn, timeout=timeout)
     else: