Updates pull request from Roman Tsypuk to convert the build system from

ant to gradle.  Removes linux and windows application launch scripts and
produces an executable jar with all resources included.

src/main/java/io/github/dsheirer/dsp/psk/QPSKStarSlicer.java

@@ -0,0 +1,58 @@
+package io.github.dsheirer.dsp.psk;
+
+import io.github.dsheirer.sample.Broadcaster;
+import io.github.dsheirer.sample.Listener;
+import io.github.dsheirer.sample.complex.Complex;
+import io.github.dsheirer.dsp.symbol.Dibit;
+
+public class QPSKStarSlicer implements Listener<Complex>
+{
+	private Broadcaster<Dibit> mBroadcaster = new Broadcaster<Dibit>();
+
+	/**
+	 * Slices a ComplexSample representing a phase shifted symbol according to
+	 * the following constellation pattern:
+	 * 
+	 *    00 | 01
+	 *    ---|---
+	 *    10 | 11
+	 */
+	public QPSKStarSlicer()
+	{
+	}
+	
+	public void dispose()
+	{
+		mBroadcaster.dispose();
+		mBroadcaster = null;
+	}
+
+	public void addListener( Listener<Dibit> listener )
+	{
+		mBroadcaster.addListener( listener );
+	}
+
+	public void removeListener( Listener<Dibit> listener )
+	{
+		mBroadcaster.removeListener( listener );
+	}
+
+	@Override
+	public void receive( Complex sample )
+	{
+		mBroadcaster.broadcast( decide( sample ) );
+	}
+	
+	public static Dibit decide( Complex sample )
+	{
+		if( sample.inphase() > 0 )
+		{
+			return sample.quadrature() > 0 ? Dibit.D00_PLUS_1 : Dibit.D10_MINUS_1;
+		}
+		else
+		{
+			return sample.quadrature() > 0 ? Dibit.D01_PLUS_3 : Dibit.D11_MINUS_3;
+		}
+	}
+	
+}