Update for Arduino 1.6.x and port to Teensy#15

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PaulStoffregen wants to merge 38 commits intogoing-digital:masterfrom

PaulStoffregen:master

Commits on Mar 15, 2016

Added calls to get non blocking talkie
Defragster
committed
Start the 2 minute song and do whatever you want . . .
Defragster
committed
say reuse IntervalTimer same interface, voice.active bool
Defragster
committed

Commits on Mar 16, 2016

voice.active() does yield
Defragster
committed
restore .set, add .setQ for non-blocking
Defragster
committed

Commits on Mar 18, 2016

Added queue 24 sounds deep
Defragster
committed

Commits on Mar 19, 2016

Update for .sayQ( 0 ) to stop sound and dump and queued items
Defragster
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T_3.2 at 24 MHz on 'old' PJRC code and after TQ mods for non-blocking
Defragster
committed

Commits on Mar 26, 2016

Have .active() return count to play
Defragster
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Add Example Exemplary of all methods
Defragster
committed

Commits on Mar 31, 2016

Examples Restore
Defragster
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Purged duplicates not Non-blocking
Defragster
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Comment the BUILTIN_LED toggle qBlink (re FrankB)
Defragster
committed

Commits on Apr 3, 2016

Restore standard qBlink toggle
Defragster
committed

Commits on Apr 5, 2016

Merge pull request #1 from Defragster/master
PaulStoffregen
committed

Commits on Apr 9, 2016

Add Prop Shield enable to all examples
PaulStoffregen
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Commits on May 18, 2016

Fix compile error with some vesions of Arduino
PaulStoffregen
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Commits on Jul 8, 2016

Use DAC0 for Mk64/MK66
FrankBoesing
authored

Commits on Jul 11, 2016

Merge pull request #2 from FrankBoesing/patch-1
PaulStoffregen
authored

Commits on Nov 27, 2016

Commits on Sep 3, 2017

Nicer fail message on Teensy 2.0 and other AVR boards without Timer2
PaulStoffregen
committed

Commits on Jan 8, 2019

updated to work with T4
mjs513
committed

Commits on Jan 10, 2019

Commits on Apr 23, 2019

Commits on Nov 20, 2019

Changed default Pin to Pin 5 and updated ReadMe
mjs513
committed

Commits on Nov 24, 2019