Added jessie as a supported realese

Before:
Error: Could not retrieve catalog from remote server: Error 400 on SERVER: unsupported release jessie at /etc/puppet/modules/java/manifests/params.pp:50

After:
Notice: /Stage[main]/Java/Package[java]/ensure: ensure changed 'purged' to 'present'
Notice: /Stage[main]/Java::Config/Exec[update-java-alternatives]/returns: executed successfully