* add samples, tests pending

* add snippet tests

* snippet and snippets_test.py linting

* snippets; recursive directory creation; rename some params

* Add directory upload snippet

…ads, as a preview feature (#943)

* checkpoint before design doc impl

* checkpoint

* more tests

* code and tests for transfer manager complete

* proactively close temp files when finished reading

* respond to comments; destroy tmp files as they are consumed

* Add system tests, docstrings, address feedback

* Respond to review comments

* verify md5 hash of downloaded file in test

* lint

* default empty strings for root arguments

* fix bug with blob constructor

* add warning about files not being deleted if their downloads fail

* docs: Add samples to multithread branch (#918)

* add samples, tests pending

* add snippet tests

* snippet and snippets_test.py linting

* snippets; recursive directory creation; rename some params

* Add directory upload snippet

* fix: remove chunked downloads; change max_workers to threads

* update snippets to add thread info

* fix snippets test issue due to change in dependency

* snippet nomenclature

* fix samples for real this time