[importer] Implement Loader#supported?
[importer] Implement Json2Csv.supported?
[importer] Implement Xslx2Csv.supported?
[importer] Implement CsvNormalizer.supported?
[importer] Refactor calls to CSV normalizers
[importer] Implement ShpLoader#supported?
[importer] Implement OsmLoader#supported?
[importer] Refactor loader dispatch
clean up
[importer] Fix broken spec for Ogr2ogr
[importer] Fix cherry-pick conflict
[importer] Fix for metrics only being caught on failed imports
CDB-187 #resolve [importer] Normalize ^M Windows EOLs
Merge branch 'hotfix/CDB-187' of github.com:CartoDB/cartodb20 into hotfix/CDB-187
[importer] Return self in Json2Csv#run if complex data (do nothing)
[importer] Use Roo instead of SimpleXlsxReader
Merge branch 'hotfix/CDB-187'