Mechanism for Auditing Network Access Not Isolated by Hystrix

https://github.com/Netflix/Hystrix/issues/116

- Java agent for instrumenting blocking and non-blocking IO and notifying of these events to a registered listener.
- Hystrix.getCurrentThreadExecutingCommand to allow querying if currently inside a command
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Merge pull request #130 from benjchristensen/issue-116-auditing-agent

Mechanism for Auditing Network Access Not Isolated by Hystrix