Handle Varying Sample Rates

[chadlagore]

When a user passes in a folder of audio files, minutes loads all of them in, concatenates them, then reshapes them into phrases. There is an edge case where some of the audio in the folder has a different sample rate. We need to handle that case or throw errors.

minutes/minutes/audio.py

Lines 25 to 27 in cf7deaa

	# Set rate as mode of rates for now.
	# TODO: Resample audio?
	self.rate = stats.mode(rates)[0][0]

[chadlagore]

Elsewhere...

If a user reads in audio files with different sample rates, our observation lengths begin to differ, and we cannot learn. One fix for this is to resample the audio to a common rate (say 44000, or some user specified number).