[JBIDE-16658]Extract browsersim from VPE git repository

Changes after after this repository was filtered out og jbosstools-vpe
1. feature/plug-in id's werent changed to keep aggregated build working
2. maven group id was changed to org.jboss.tools.sim
3. references to vpe features/plugins removed from aggregation pom files
   and update site
4. new feature created for browsersim tests
5. reference to aerogear nightly p2repository added to root pom.xml,
   because cordovasim depends on it