Uspto-opendata-python

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- Minor fixes and Python3 compatibility

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- Python3 compatibility
- Add command line program ``uspto-pbd`` for printing and saving documents from the USPTO PAIR Bulk Data API

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- Implement the basic query and download parts of the USPTO PAIR Bulk Data API
- Implement Celery-based downloader infrastructure

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- Basic framework for asynchronous and parallel API interaction based on Celery