optimizing serialization;
Merge branch 'master' of https://github.com/europeana/uim-core.git
added consortia synchronization;
Merge branch 'master' of https://github.com/europeana/uim-core.git
add grz to ger mapping;
metadatarecord as separate tkeys;
Merge branch 'master' of https://github.com/europeana/uim-core.git