Added functionality based on the forum feedback.

1) http://zeroturnaround.com/forums/topic/refreshing-the-maven-generated-rebel-xml-file-in-eclipse/
2) http://zeroturnaround.com/forums/topic/switch-to-skip-jrebel-maven-plugin-execution/ & http://zeroturnaround.com/forums/topic/jrebel-maven-plugin-needs-skip-attribute/