Added AudioFilterFIR which performs FIR filter
using user-supplied coefficients
Removed extraneous comment lines
Delete *.bak
Add the fir_filer sketch to the examples directory
Add chorus and flange effects and an example sketch for each
AudioSynthWaveform updated to add tone ramping when a tone starts and ends
PlayMidiTones example modified to work with ramping.
Cosmetic fix to Flange.begin
Correct the calculation of delay_rate_incr
Correct storage class of some variables in FIR
Merge branch 'master' of github.com:PaulStoffregen/Audio (Pete's changes)

Conflicts:
	Audio.cpp
	Audio.h