Merge pull request #212 from brharrington/master

allow jmx registry name to be customized via property (https://github.co...
Remove usage of guava maps
Merge pull request #214 from dmuino/guava

Remove usage of guava maps
Call timer.record() with a timeunit
fix warnings
By default we have two pollers
Merge pull request #216 from dmuino/defaultPollers

By default we have two pollers
[Gradle Release Plugin] - pre tag commit:  '0.5.4'.
[Gradle Release Plugin] - new version commit:  '0.5.5-SNAPSHOT'.
add in example of using jvm poller
update example config to leverage servo.pollers
remove examples from servo-core package, look at servo-example project instead (https://github.com/Netflix/servo/issues/215)