! core: introduce system + jvm metrics
! kamon-system-metrics: introducing System and JVM metrics module
= kamon-system-metrics: SynchronizedSigar in order to share the same instance
= kamon-system-metrics: added scale in Memory and Network metrics
Update .travis.yml

+ travis: "java.io.tmpdir" environment variable
+ core,spray: create and implement http server metrics for spray, related to #56
+ travis: create a temp folder before building
= kamon-system-metrics: fork in test
= kamon-system-metrics: Initialization-on-demand holder idiom in order to load one instance of Sigar
= kamon-system-metrics: introduce actor system collector
= kamon-system-metrics: collector actor refactor
= kamon-system-metrics: round math in toLong
= kamon-system-metrics: source format
= kamon-system-metrics: system metrics loaded banner + some OS info with system load average and uptime
+ play: record http server metrics, closes #56
= sysmetrics: remove empty lines at the end of sigar index
kamon-system-metrics: add system metrics to datadog and statsd modules
= newrelic: upgrade to the latest metrics scheme, closes #54
= kamon-system-metrics: ignore system metrics test for now
= core: subscription protocol specification, closes #51