Tests for http instrumentation

Merge pull request #52 from Financial-Times/tests

added some tests for http instrumentation

v1.16.3: Merge pull request #51 from Financial-Times/wheresrhys-patch-1

Fixed bug with registering http reporters

v1.16.2: Merge pull request #50 from Financial-Times/services-spec

added tests for service names

Adding services list for fetch

Forgot to merge before last release

Added services list

Merge pull request #47 from Financial-Times/matthew-andrews-patch-2

Slice the `v` off of `v4`, as `process.version` is like this `v4.1.2`

v1.15.0: Merge pull request #48 from Financial-Times/remove-old-stuff

removed legacy metrics

v1.14.0: Merge pull request #46 from Financial-Times/miss-scarlet

Remove scarlet from the metric logging

v1.13.0: Merge pull request #44 from Financial-Times/method

splitting express metrics by request method

Send the region if one is set

Merge pull request #41 from Financial-Times/region

Add region to next-metrics

Measure timeouts separate from other errors

Merge pull request #40 from Financial-Times/timeout-metrics

Measure timeouts separate from other failures