Jim

To avoid an E_NOTICE, check `Ratelimit-Remaining` header existence.

1

Pretty much says it all, the diff is simple enough.

This is working well for us so far! Also, [this concurrency issue](http://stackoverflow.com/questions/22470422/hiredis-timeout-with-large-number-of-concurrent-requests) seems to be resolved in this build. Can't say if it's due to the changes reflected here, or...