B-38216 Improvements for http-logging-config.xsd

Updated XSD to better check logging configuration file.
B-48281 Create Base MetricsService

- Created MetricService to be used to instrument Repose
- Removed old non-used MetricsRegisteryService
- Created unit tests for generating Meters & Counters
- Created metrics.cfg.xml format
Merge pull request #529 from usnavi/logging.xsd

B-38216 Improvements for http-logging-config.xsd
Merge branch 'master' of https://github.com/rackerlabs/repose into MetricsService
B-48281 Create the Base Metrics Service

- Adding MetricsService to ContextAdapter
merging in updates.
Merge branch 'MetricsService' of https://github.com/usnavi/repose into MetricsService