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/NRZDecoder.java

@@ -0,0 +1,77 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 Dennis Sheirer
+ * 
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ ******************************************************************************/
+package io.github.dsheirer.dsp;
+
+import io.github.dsheirer.sample.Listener;
+
+public class NRZDecoder implements Listener<Boolean>
+{
+	public final static boolean MODE_NORMAL = true;
+	public final static boolean MODE_INVERTED = false;
+	
+	private Listener<Boolean> mListener;
+	private boolean mMode = MODE_NORMAL;
+	private boolean mPrevious;
+
+	/**
+	 * Non Return To Zero (NRZ) and NRZ Inverted (NRZ-I) Decoder.
+	 * 
+	 * Use default constructor for NRZ output.  Use the alternate constructor
+	 * with the MODE_INVERTED argument for NRZ-I output.
+	 * 
+	 * Performs XOR of incoming bit with previous output and sends the result
+	 * to the registered listener.  
+	 */
+	public NRZDecoder( boolean mode )
+	{
+		mMode = mode;
+	}
+	
+	public NRZDecoder()
+	{
+		this( MODE_NORMAL );
+	}
+	
+	public void dispose()
+	{
+		mListener = null;
+	}
+
+	@Override
+    public void receive( Boolean bit )
+    {
+		boolean result = mPrevious ^ bit;
+		
+		if( mListener != null )
+		{
+			mListener.receive( mMode ? result : !result );
+		}
+		
+		mPrevious = result;
+    }
+
+	public void setListener( Listener<Boolean> listener )
+	{
+		mListener = listener;
+	}
+	
+	public void removeListener( Listener<Boolean> listener )
+	{
+		mListener = null;
+	}
+}