moved maven dependencies to p2 site

deleted every log4j.properties file
removed every jar file
rewrite target definition to use remote p2 sites
moved metadata-model-tools to p2 site
moved maven dependencies to maven-osgi-bundles, which builds a p2 site
removed all logging projects
slf4j and plugin logs are now handled by PAX logging bundle
  (see https://ops4j1.jira.com/wiki/display/paxlogging/Pax+Logging)
moved log to workbench.log file in the install folder