Fix delete() and add unit tests
Create users with password
More fixes and tests, especially for delete
Convert AbstractAPI to use abc.ABCMeta
Fixes for LRUCache, flake8 fixes, minor bug fixes.
Add fetch_all, improve tests
Implemented FeatureTableManager
Add tests for FeatureTableManager
Removed unused code
Remove unused files
Use .cols instead of .header
Add metadata to FeatureRow