Upgrade Akka 2.0.2 and Logback 1.0.4
Upgrade Akka 2.0.2 and Logback 1.0.4

gatling/gatling,MykolaB/gatling,thkluge/gatling,timve/gatling,gatling/gatling,gatling/gatling,pwielgolaski/gatling,wiacekm/gatling,wiacekm/gatling,ryez/gatling,gatling/gatling,ryez/gatling,MykolaB/gatling,GabrielPlassard/gatling,pwielgolaski/gatling,timve/gatling,GabrielPlassard/gatling,pwielgolaski/gatling,wiacekm/gatling,GabrielPlassard/gatling,pwielgolaski/gatling,MykolaB/gatling,thkluge/gatling,thkluge/gatling,wiacekm/gatling,GabrielPlassard/gatling,ryez/gatling,gatling/gatling,thkluge/gatling,wiacekm/gatling,MykolaB/gatling,timve/gatling,timve/gatling,ryez/gatling