JBIDE-18544 migrate from http://download.jboss.org/jbosstools/updates/development/luna/central/earlyaccess/ to http://download.jboss.org/jbosstools/earlyaccess/development/luna/ >> master

4.2.0 is "latest milestone", whereas 4.2.0.Final is "latest stable release". 

So once 4.2.0.Final comes out, we can still have an entry for 4.2.0.x (to support & not break existing Beta/CR users) but we will also need to add an entry for 4.2.1.x.