Initial implementation for AvroKR2RMLRDFWriter
Added ability to import/export Avro interactively

Also fixed bug where KR2RMLMappingGenerator created duplicate POMs
Merge branch 'development' into avro
Removed system.out.println from test
Refactored out common code in ImportFileCommands
Added avro writer specialized edges support
Merge pull request #127 from InformationIntegrationGroup/avro

Avro