change the gruntfiles watch:test tasks
add and remove the canvas element to the document before/after the test
rename AudioBase to Sound and move the Sound plugin to plugins/sound, also make the plugins generate relative urls with require.toUrl
Merge pull request #80 from iceddev/plugin-fixes

make the plugins generate relative urls with require.toUrl - fixes #76
Merge branch '0.3.0' into sound

Conflicts:
	src/sounds/AudioBase.js
	src/sounds/HTML5Audio.js
	src/sounds/WebAudio.js
add _chooseFormat and _nextFormat to Sound