Adding DTrace probes for debugging
Implementing `precise` module for nanosecond timing for dtrace probes
Fixing alignment
And this file..
Updating existing probes such that the precise timer is stopped before the probe fires so it doesn't take that latency into account, fixing #279 by unsetting the `content-length` header within `proxy().handle()`

Build artifact
Completing dtrace probe implementation
Adding a config boolean at `logs.dtrace` to silence the dtrace probes (default is `true`)
Removing an unneeded variable
Updating docs
This was supposed to be `true`
Removing a deprecated config value
Fixing a parameter passed from `respond()` to `headers()`, fixes #278
Merge pull request #280 from avoidwork/AcceptRangeHEAD

Minor fixes