plog-kafka: clean up stats

- Don't include "_rate" for metrics with a count and multiple rates
- Clearly identify 1, 5 and 15-min intervals using objects
Merge pull request #77 from airbnb/pierre/kafka/cleanup_stats_reporting

plog-kafka: clean up stats
Merge pull request #78 from airbnb/pierre/guava_services

plog-server: guava's service abstraction, graceful shutdowns
final most things & style cleanups
Braces everywhere

Let's not goto fail.

Inline with the Google Java Style,
https://google-styleguide.googlecode.com/svn/trunk/javaguide.html