D-Net

#1435 making PMC XML parser less strict in terms of expected input elements or attributes: article-type is set to 'unknown' value when attribute not defined in XML main element

#1431 fixing PMC XML records parser disallowing null reference type, reference value will be simply omitted

#1383 replacing explicitly defined test cluster properties with init-test-cluster-config maven profile usage

merging trunk changes with IIS-CDH-5.3.0 branch

#1381 reintroducing yadda repository required by cermine

#1381 porting pmc citations ingestion from cascading framework to pig. Moving code from icm-iis-ingest-pmc to icm-iis-transformers including itegration tests, removing obsolete scala code along with unneded dependencies. Switching subworkflow in primary workflow.

updating job.properties

#1370 making pmc ingestion integration tests run on dedicated test cluster istead of embedded mini-oozie container

#1329 setting affiliation string as raw text if parser produced empty Element object

#1330 icm-iis-metadataextraction and icm-iis-ingest-pmc modules cermine dependency upgraded to recently released 1.6 version