Fixed org.eclipse.jetty.server.handler.AbstractHandler warnings

This fixes the warnings that occur when `org.eclipse.jetty.server.handler.AbstractHandler` instances do not have a Server set, such as:

```
WARN  [2014-02-28 03:24:31,674] org.eclipse.jetty.server.handler.AbstractHandler: No Server set for org.eclipse.jetty.server.handler.ErrorHandler@63b7e77
WARN  [2014-02-28 03:24:31,687] org.eclipse.jetty.server.handler.AbstractHandler: No Server set for com.codahale.metrics.jetty9.InstrumentedHandler@3fdd2ed5
WARN  [2014-02-28 03:24:31,696] org.eclipse.jetty.server.handler.AbstractHandler: No Server set for i.d.j.MutableServletContextHandler@2edfbe28{/,null,STARTING}
WARN  [2014-02-28 03:24:31,696] org.eclipse.jetty.server.handler.AbstractHandler: No Server set for org.eclipse.jetty.servlet.ServletHandler@633d4c22
WARN  [2014-02-28 03:24:32,166] org.eclipse.jetty.server.handler.AbstractHandler: No Server set for i.d.j.MutableServletContextHandler@515dd9a7{/,null,STARTING}
WARN  [2014-02-28 03:24:32,166] org.eclipse.jetty.server.handler.AbstractHandler: No Server set for org.eclipse.jetty.servlet.ServletHandler@687c8cac
```