SoundManager

The Sound Manager is responsible for playing back audio via either the Legacy HTML Audio tag or via Web Audio if the browser supports it.
Note: On Firefox 25+ on Linux if you have media.gstreamer disabled in about:config then it cannot play back mp3 or m4a files.
The audio file type and the encoding of those files are extremely important. Not all browsers can play all audio formats.
There is a good guide to what's supported here: http://hpr.dogphilosophy.net/test/

If you are reloading a Phaser Game on a page that never properly refreshes (such as in an AngularJS project) then you will quickly run out
of AudioContext nodes. If this is the case create a global var called PhaserGlobal on the window object before creating the game. The active
AudioContext will then be sa