D-Net

branch to work on the hbase model simplification

using solrj 7.x client

force gson to serialise dates inside the map as long (the ES mapping assumes to find such type)

force gson to serialise dates in a format that can be undrestood by ElasticSearch

Fixed date parsing in OAI

cleanup

#3110 Support incremental harvesting: setting dateOfTransformation as datestamp whenever available

refactored broker events generation

cleanup

integrated exportSummaryRecordsJob mapper from dnet40