Added package-test target to pack tests into its own jar. It may help in 3rd party plugins development, since many test tools from CC are quite usefull.
Properties passed to builders are used to resolve properties in the texts (currently texts in <msg></msg> tags only!)
WriterBuilder added among default plugins
Fix NullPointerException when Modification#... fields are accessed
Fix of case where file properties contained ${} reference to a property defined by builders
Addd the possibility to override properties defined in plugin by properties defined in actual project