Add Skylight stuff
Add Dalli instrumentation to Skylight
skylight: only load extension if skylight is available
skylight: Add Redis probe
Remove New Relic
Update travis-support

This is needed so travis-support does not fail on loading NewRelic RPM.
skylight: refactor more into extension
skylight: use Sinatra support from skylight gem

This hasn't been merged in yet, so use my fork for now.
skylight: extract probes from config.ru
skylight: add service probe
Merge pull request #119 from travis-ci/hh-skylight

Skylight