Bump library version to 2.4.0 

Fix LowLevelEngine example 

Remove amplitude check restrictions on AudioSample (closes #93) 

Don't probe output devices on Android 

Prevent ArrayIndexOutOfBoundsException when none of the devices have … …any inputs

Implement mp3/ogg/.. SoundFile decoding using JavaSound This will break Android support to some extent, but fixes #32 by switching to the much more well-supported (and 4x faster!) mp3spi, closes #53 by adding support via vorbisspi, and also fixes #15 since 8 bit wav files are are now simply decoded through JavaSound.

Load PortAudio when LineUnsupportedException occurs (refs #85) 

Update Javadoc 

Add constructor argument and method to SoundFile to control caching (… …implements #47)