CAY-1883 - Clean up Cayenne maven structure - get rid of aggregate modules

removing cayenne-build-maven-plugin... we'll be initializing date via Maven

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1542715 13f79535-47bb-0310-9956-ffa450edef68
CAY-1883 - Clean up Cayenne maven structure - get rid of aggregate modules

have to explicitly declare license inclusion in each distributed module...

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1542716 13f79535-47bb-0310-9956-ffa450edef68