QTZ-301 Merge branch 2.2.x to trunk : copied classes and resources from quartz 2.2.x to quartz-core, quartz-plugins and quartz-jobs in trunk; fixed pom for examples and system tests modules to reference quartz-core; merged the quartz 2.2.x integrations tests to quartz-core and quartz-plugins tests; mvn clean install passes, import to eclipse ide with m2e works fine too