update version of cargo : 1.4.11

Cargo 1.4.11 now support War Extra class path (benjamin Bentmann old feature to webby in cargo snapshot) : https://jira.codehaus.org/secure/ReleaseNote.jspa?styleName=Html&projectId=10730&version=20629 
The version of uberjar cargo in webby could be updated, and change to release version now.
If this pull request is accepted, I give another one to add Apache TomEE support in Webby.
Thanks