[pom] Update assertj to 2.4.0
[pom] Update assertj to 2.4.0

AriSuutariST/waffle,Waffle/waffle,Waffle/waffle,dblock/waffle,hazendaz/waffle,hazendaz/waffle,hazendaz/waffle,dblock/waffle,dblock/waffle,AriSuutariST/waffle,AriSuutariST/waffle,AriSuutariST/waffle,dblock/waffle,Waffle/waffle