added --resourceID command-line argument to cadc-cdp and cadc-cert-gen; removed --cred arg from cadc-cert-gen

changed module names to lower-case and group to org.opencadc to conform to maven repo naming standards

added --userdn option to command line wrapper to support working with externally delegated certificates with no internal userid

moved ost of the internal code to cadcCDP-Server and re-org packages; made CredClient able to perform both CDP and get-proxy-cert actions