updated copyright header

LICENSE

Makefile

api/v1/Makefile

api/v1/api.go

api/v1/api_files.go

api/v1/api_groups.go

api/v1/api_imports.go

api/v1/api_playlists.go

api/v1/api_uploads.go

api/v1/types.go

api/v1/utils.go

cmd/tank/config.go

cmd/tank/main.go

cmd/tank/web.go

importer/Makefile

importer/config.go

importer/converter_utils.go

importer/converter_utils_test.go

importer/fetch.go

importer/fetch_converter.go