Add play audio support

[stevenpaklau]

Working in progress

[codecov]

Codecov Report

Merging #5 into master will decrease coverage by 37.41%.
The diff coverage is 2.83%.

@@              Coverage Diff              @@
##             master       #5       +/-   ##
=============================================
- Coverage     81.66%   44.24%   -37.42%     
- Complexity       39       61       +22     
=============================================
  Files             5        7        +2     
  Lines           120      226      +106     
=============================================
+ Hits             98      100        +2     
- Misses           22      126      +104

Impacted Files	Coverage Δ	Complexity Δ
src/Extensions/Stream.php	0% <0%> (ø)	9 <9> (?)
src/Extensions/Directives.php	0% <0%> (ø)	12 <12> (?)
src/AmazonAlexaDriver.php	94.73% <100%> (-1.56%)	23 <0> (+1)

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