bump to latest stable 2.x metrics
Include support for sending metrics to various reporting backends (ie
ganglia, graphite) via metrics-reporter-config.  Disabled by default.

See also: https://github.com/addthis/metrics-reporter-config
Merge branch 'metrics-reporter' of https://github.com/cburroughs/collins into cburroughs-metrics-reporter

Conflicts:
	build.sbt
Updating reporter config version.