Added MIT License to source files
Collapsed Copy Constructor and clone plugins into the same plugin class
Merge branch 'master' of https://github.com/mklemm/jaxb2-rich-contract-plugin

Conflicts:
	src/main/java/com/kscs/util/plugins/xjc/BuilderGenerator.java
	src/main/java/com/kscs/util/plugins/xjc/ChainedBuilderGenerator.java