Resolves #387 10 second/10 minute audio recording time limit.

Updated audio packet wave recorder to correctly dequeue audio packets
to ensure that the overflowable buffer queue accounting process was
working correctly.

Updated overflowable buffer queue's poll() method to correctly decrement
the queue size counter.

Resolved issue where the mutable metadata was being prematurely reset
and causing the end audio packet to be mis-identified.  This resulted
in the recording manager not stopping the recording on command with the
timeout mechanism kicking in after a brief delay.

src/main/java/io/github/dsheirer/sample/OverflowableTransferQueue.java

@@ -101,7 +101,14 @@ public class OverflowableTransferQueue<E>
      */
     public E poll()
     {
-        return mQueue.poll();
+        E element = mQueue.poll();
+
+        if(element != null)
+        {
+            mCounter.decrementAndGet();
+        }
+
+        return element;
     }
 
     /**