- update maven-clean-plugin to version 2.6.1
- update maven-jxr-plugin to version 2.5
- introduce property for version number for
maven-surefire-report-plugin, maven-failsafe-plugin,
maven-surefire-plugin
- update maven-surefire-report-plugin, maven-failsafe-plugin,
maven-surefire-plugin to version 2.18