Updated readme instructions for whelkoperation import
Added linkenhancer to mock_whelks and whelkoperations configs
Refactored IndexBasedFormatAugmenter
IndexBasedFormatAugmenter is now JsonLDIndexBasedEnhancerFormatConverter
OAIPMHImporter adding links and tags to document as metadata before format conversion
Merge branch 'master' of github.com:libris/librisxl