Simple prototype for adding metrics
MetricsWrapper and it's usage for one metric
Move metrics related to actors to Codahale instead of the yammer metric api. Fix a few typos.
Add gauge creation to MetricsWrapper. Further conversion to codahale metric usage.
Further removal of YammerMetrics usage. Context and job latency related metrics. Consistency in naming.
Fix a minor metrics inconsistency.
Fix register() usage to pass tests.
Added config parser for datadog reporting
Added datadog reporting
Added tests for config parser for datadog reporting.
Added metrics for caches such as job results and apps.
Parses datadog reporting config from only jobserver config file and code cleanup.
Removed parsing datadog agent config file.
Cleaned up comments in JobStatusActor.
Added tests for cache metrics.
Merge pull request #77 from ooyala/js-monitoring

Eanble Datadog monitoring for spark jobserver