Version 1.1.5

The RatePlanCharge change I've had implemented but not checked in for a while.  It's for use in subscription modification and is safe otherwise.  The other changes are:
1) Finally a legit way of stopping Zuora from returning the invoice PDF data in query responses.
2) In production the Zuora requests are logged to STDOUT and end up in the passenger log instead of production.log.  Hoping explicitly telling it to log will fix it.