Enforce JDK 7+; jbpm-console-ng-showcase won't compile with JDK 6 anymore
Enforce JDK 7+; jbpm-console-ng-showcase won't compile with JDK 6 anymore

 * it is better to fail fast instead of waiting several
   minutes until the build gets to jbpm-console-ng-showcase
   and then seeing it fail during GWT compilation

 * we still need to support Java 6 on the server. Only the
   client side GWT-related deps can be Java 7+. animal-sniffer
   plugin will be used to ensure that.

etirelli/jbpm-console-ng,etirelli/jbpm-console-ng,pefernan/jbpm-console-ng,nmirasch/jbpm-console-ng,cristianonicolai/jbpm-wb,droolsjbpm/jbpm-wb,droolsjbpm/jbpm-console-ng,droolsjbpm/jbpm-console-ng,rbarriuso/jbpm-wb,emilianoandre/jbpm-console-ng,cristianonicolai/jbpm-wb,droolsjbpm/jbpm-wb,pefernan/jbpm-console-ng,rbarriuso/jbpm-wb,rorogarcete/jbpm-console-ng,rorogarcete/jbpm-console-ng,annabaker/jbpm-wb,cristianonicolai/jbpm-console-ng,emilianoandre/jbpm-console-ng,annabaker/jbpm-wb,cristianonicolai/jbpm-console-ng,nmirasch/jbpm-console-ng