v6.4.0

Make filters more intuitive for manifest download (#338)
Make file filters more intuitive for bundle download (#207)
Fix get collection iteration bug. (#407)
Clarify how bundle manifest can be a DSSFile
Correct bundle.json format from dict to array (#398)
Fix timestamp in bundle.json download log
Rename metadata to manifest for bundle.json download
Clarity improvement to download-collection
Update CLI integration tests for brevity
Skip download-collections tests on Windows
[easy] Help menu formatting. (#395)
Add basic support for downloading collections (closes #339)
Download bundle metadata into bundle.json (#231)