CMS7-7688 Add pom for deployment to Nexus

The source version and optimized version are deployed in two
separate .jar files. All files in these JARs are located below
the directory /ckeditor so they will be served by the
CKEditorResourceServlet in the Hippo CMS application.
CMS7-7688 include license file in created JARs, fixed Hippo license headers
CMS7-7688 exclude unnecessary and unwanted files from the optimized JAR