Upgrade Logback 1.0.9, close #860
Upgrade Logback 1.0.9, close #860

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