Partridge

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* Improves read time for large feeds by adding LRU caching to ``ptg.parsers.parse_time``.

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* Gracefully handle completely empty files. This change unifies the behavior of reading from a CSV with a header only (no data rows) and a completely empty (zero bytes) file in the zip.

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* Fix handling of nested folders and zip containing nested folders.
* Add ``ptg.get_filtered_feed`` for multi-file filtering.

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* Fix bug in ``ptg.read_service_ids_by_date``. Reported by cjer in 27.

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* Published package no longer includes unnecessary fixtures to reduce the size.
* Naively write a feed object to a zip file with ``ptg.write_feed_dangerously``.
* Read the earliest, busiest date and its ``service_id``'s from a feed with ``ptg.read_busiest_date``.
* Bug fix: Handle ``calendar.txt``/``calendar_dates.txt`` entries w/o applicable trips.

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* Add support for reading files from a folder. Thanks again danielsclint!