Updated to Metrics 3.0.0-BETA3 (See thinkaurelius/titan#268).
Merge branch 'master' into titan-metrics2
Merge remote-tracking branch 'zachkinstner/titan-metrics2'

Conflicts:
	rexster-server/src/main/java/com/tinkerpop/rexster/server/HttpRexsterServer.java
	rexster-server/src/main/java/com/tinkerpop/rexster/server/RexProRexsterServer.java
	rexster-server/src/main/java/com/tinkerpop/rexster/server/metrics/ReporterConfig.java