[COOK-1860] - use ! so failed command raises exception
[COOK-1860] - use ! so failed command raises exception

susiem/maven,rapid7/maven,johnbellone/maven-cookbook,martoe/chef-cookbook-maven,centraldesktop/maven,RelateIQ-chef/maven,leifmadsen/maven,nshemonsky/chef-maven,opscode-cookbooks/maven,chef-cookbooks/maven,Gesto/maven,amferraz/maven,geocent-cookbooks/maven,praste/maven,jvanderhoof/maven,chef-cookbooks/maven,juliandunn/maven,zenoss/maven,opscode-cookbooks/maven,Tout/maven,RelateIQ-chef/maven,nshemonsky/chef-maven,johnlcox/maven_temp,bbg-cookbooks/maven,johnbellone/maven-cookbook,gildegoma/chef-maven,praste/maven,miguelaferreira/maven,klyall/cookbook-maven,niilo/maven,rapid7/maven