Merge branch 'fix-gif2video' into develop
Track time taken to transcode GIFs
Set the 'via' response header instead of 'proxy-agent'
Add a 'x-original-content-length' response header

This contains the original 'content-length' header value which
allows the UA to determine its own total compression ratio.
Optionally (but by default) accumulate in ingress when we don't have content-length

This allows us to then write a content-length (and more importantly,
x-original-content-length).
Merge branch 'header-stuff' into develop
Fix the build
Added code coverage command.
Delay post-processing and caching for quick response.
Fork plugin on by default in production only.
Merge branch 'pipeline' into develop
Add coverage dir to gitignore.
Fix metrics reporting.
Move default metrics reporting out of plugins.
Merge branch 'metrics' into develop
Add fork tests.
Merge branch 'test-pipeline' into develop
Add metrics sessions, don't use global event emitter for reporting.
Delete emit.js.
Merge branch 'metrics' into develop