Number of retries were not being incremented
Make optimal delay a config option, and reset to this if the delay interval has been increased for retrying
Only reset delay if a retry has happened
Undo resetting the delay, test now makes sure that the delay stays set
Optimise performance of requestManager backoff
Once a queue has completed, set the requestmanager delay back to the initial default value
mixInTo method was confusing
Remove the incorrect-cased contentCalls.js from git
Merge pull request #3 from Financial-Times/fix-retry-behaviour

Fix retry behaviour