Various improvements to per pid collection/metrics
Merge branch 'master' of github.com:square/prodeng into s-tuning

* 'master' of github.com:square/prodeng:
  Update README.md
  Update README.md
  start ticker at 1 for rate calc to disambiguate

Conflicts:
	metrics/metrics.go
	metrics/metrics_test.go
bah
Merge pull request #38 from square/s-stuff

various improvements to per pid collection/metrics