0.9.1

Improvements

• [rails] use direct instrumentation instead of Rails built-in instrumentation avoiding a level of indirection (#235)
• [core] remove debug logging when the Pin instance is retrieved, removing the time spent in this critical path (#233)
• [core] add an exponential back-off to our flushing strategy so that the thread will flush less often if the Trace Agent is not available (#239)
• [core] remove duplicate filter on Trace#trace (#234)

Bugfixes

• [resque] safe-guard if the Pin is nil (#223, #242 -- thanks @drewbailey)
• [resque] cleanup the current Context after the process fork to avoid useless Copy-on-Write (#231)

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