Bump to Scala 2.8.1.
Bump to Scala 2.8.1.

timezra/metrics,slachiewicz/metrics,chenxianghua2014/metrics,gorzell/metrics,slovdahl/metrics,mnuessler/metrics,thelastpickle/metrics,dropwizard/metrics,dropwizard/metrics,tempredirect/metrics,infusionsoft/yammer-metrics,randomstatistic/metrics,jasw/metrics,gburton1/metrics,ind9/metrics,ChetnaChaudhari/metrics,mattnelson/metrics,egymgmbh/metrics,kevintvh/metrics,mspiegel/metrics,dropwizard/metrics,fcrepo4-archive/metrics,AltitudeDigital/metrics,mtakaki/metrics,gorzell/metrics,mveitas/metrics,gburton1/metrics,fcrepo4-archive/metrics,valery1707/dropwizard-metrics,mveitas/metrics,scullxbones/metrics-scala,erikvanoosten/metrics-scala,gorzell/metrics,signalfx/metrics,bentatham/metrics,Banno/metrics,rexren/metrics,wickedshimmy/metrics-scala,infusionsoft/yammer-metrics,maciej/metrics-scala,ohr/metrics,box/metrics,cirrus-dev/metrics,wfxiang08/metrics,unitsofmeasurement/metrics,jplock/metrics,mt0803/metrics,box/metrics