D-Net

#118 introducing log entry schema

#913 renaming DocumentContentUrl#contentSize to DocumentContentUrl#contentSizeKB changing field type from int to long, importing content size from ObjectStoreFile#fileSizeKB, updating dnet-objectstore-rmi dependency from 1.0.0 to 2.0.1-SNAPSHOT

#913 changing DocumentContentUrl#contentSize field type from string to int

#913 introducing DocumentContentUrl#contentSize field, handling it properly in all PIG transformers

#840 moving IdentifierMapping from importer to common package

#840 renaming DeduplicationMapping to more generic IdentifierMapping

introducing PmidMapping schema

updating countryCode comment to: country ISO 3166-1 alpha-2 uppercased code

Adding info on where to find types of citations produced by PMC citation ingestmodule

fixing comment