Merge pull request #50 from airbnb/darnaut--misc-fixes

Misc fixes

Merge pull request #49 from airbnb/oj-strict-mode

Load JSON objects in strict mode

Merge pull request #47 from noggi/ak_opt_various

Multiple changes

Merge pull request #45 from airbnb/rack-key-space-limit

Allow configuration of Rack's key_space_limit

Merge pull request #44 from airbnb/ddtrace

Support for Datadog's tracing client

Merge pull request #43 from airbnb/ramya/fix-gem-version

get_process_mem set version to avoid crash

Merge pull request #41 from airbnb/darnaut/sqs-events

Support for sending events to SQS

Merge pull request #40 from noggi/lock_oj

Lock oj gem version

Merge pull request #37 from weeyum/weeyum--add-newrelic-zk-tracing

Enable Newrelic Zookeeper transaction tracing

Merge pull request #35 from airbnb/darnaut/gc-stats

Add option to enable garbage collection instrumentation