Many, many small and large changes

->Added Javadocs to Audio.java
->Moved updating code to new class, UpdateHandler.java
->Made new class, DataTracker.java (unimplemented)
->Added Javadocs to Email.java
->Made Email.java getCarrierExtension() method more reliable
->Made more verbose Email.sendMessage() output
->Moved Thread.sleep() in KeyboardHandler to submitLine() method
->Added Javadocs to PAXChecker.java
Organized code more

-Moved Data tracking code from Browser to DataTracker
-Switch Thread.sleep() in PAXChecker to a CountDownLatch
-Removed class-wide URL objects from UpdateHandler
-Moved shouldUpdateProgram code from PAXChecker to UpdateHandler