0.5.0a0

This is the first alpha release of the 0.5 series

The main change with respect to the v0.4 series is a modification of the flight call classification algorithm which enforces hierarchical consistency in the TaxoNet output. We now ensure that the predicted species belongs to the predicted family and that the predicted family belongs to the predicted order.
See #73 for a description of the algorithm

Additionally, BirdVoxDetect now reports order confidence, family confidence, and species confidence in addition to detection confidence.