merging trunk changes with IIS-CDH-5.3.0 branch
creating IIS-CDH-5.3.0 branch
reenabling document to project reference import validation
#1195 removing obsolete ports docreation and datasetid from hbase mapred import, removing references to those ports in workflow.xml files, updating transformer by removing filtering by datasetid due to decisions made in #1072
fixing json escape character by putting \\ in place of \
extending mapreduce metadata importer test with validating import of different kind of relations and dataset identifier
fixing HBase model json representation to be compliant with most recent dnet-openaire-data-protos:3.0.0-SNAPSHOT model: complex relation identifiers, dataInfo on fields level etc