0.4.0a1

This is the second alpha release of the 0.4 series.
The main change with respect to the v0.3 series is the improved species classifier (TaxoNet). Furthermore, each detected event now contains predictions at coarser taxonomical levels (family and order) in addition to species.
The process_file function now supports a new keyword argument, predict_proba, defaulting to False. If set to true, BirdVoxDetect will export a JSON file containing probabilistic predictions for every species, family, and order in TaxoNet. The JSON file also contains a copy of the BirdVoxClassify taxonomy, a copy of the sensor fault log given by BIrdVoxActivate, and additional metadata: file name, audio duration, MD5 checksum, package versions, hardware specifications, and elapsed time.