Missing exit events

Managed to capture some debug logging for the missing exit events I was seeing on Ghost 0.5.1.

https://robsalmond.tv.appneta.com/traces/rawview/4A036E9EBB48B933CA86ED10F368A8B784F06910

```
$ grep 4A036E9EBB48B933CA86ED10F368A8B784F06910 tracing.log 
Fri, 12 Sep 2014 04:32:23 GMT traceview:layer contuining nodejs layer from 1B4A036E9EBB48B933CA86ED10F368A8B784F06910104925163EFC5C85
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:edge 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE added edge 1B4A036E9EBB48B933CA86ED10F368A8B784F06910104925163EFC5C85
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:edge 1B4A036E9EBB48B933CA86ED10F368A8B784F06910FA7080496567C6E0 added edge 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:enter restoring request context to 1B4A036E9EBB48B933CA86ED10F368A8B784F06910104925163EFC5C85
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:enter 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set as last event
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set Layer = nodejs
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set Label = entry
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set Proto = http
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set URL = /public/jquery.min.js?v=a2441196ec
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set Method = GET
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set HTTP-Host = box
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set ClientIP = 127.0.0.1
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:change 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE set Forwarded-For = 54.87.60.176
Fri, 12 Sep 2014 04:32:23 GMT traceview:event:send 1B4A036E9EBB48B933CA86ED10F368A8B784F069100882CA1B1113A7FE sent to reporter
```

If it'll help shoot me a pubkey and I'll give you an account on the box to take a closer look.