Creating branch 2.2.x to integrate updates targeting infrastructures that must not adopt the new management of contexts.
[maven-release-plugin] copy for tag dnet-openaireplus-mapping-utils-2.2.0
added protobuf to solr document transformer
fixed test
merged branch ProtoMapping
revised tests
added one more test for organizations
derp changes
removed protocolbuffers dependency from dnet-pace-core, Builders and Proto specific tests moved in dnet-openaireplus-mapping-utils, adapted dnet-mapreduce-jobs
class moved to src/main/java
unit test
merged from branch 2.0.0