Added 'ant-contrib' package to 'apt install ant1.8-optional' command. On Ubuntu 11.10 (not sure about other versions) it is needed due to '<taskdef resource="net/sf/antcontrib/antcontrib.properties" />'
the clone command was asking for key and authentification; Replaced with the public url;
Updated Building OneSwarm on Ubuntu (markdown)
Created Building on Ubuntu (markdown)