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/sample/Broadcaster.java

@@ -0,0 +1,86 @@
+/*******************************************************************************
+ *     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.sample;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+/**
+ * Broadcasts an item to multiple listeners
+ */
+public class Broadcaster<T> implements Listener<T>
+{
+	private List<Listener<T>> mListeners = new CopyOnWriteArrayList<>();
+
+	@Override
+    public void receive( T t )
+    {
+		broadcast( t );
+    }
+	
+	/**
+	 * Clear listeners to prepare for garbage collection
+	 */
+	public void dispose()
+	{
+		mListeners.clear();
+	}
+	
+	public boolean hasListeners()
+	{
+		return !mListeners.isEmpty();
+	}
+	
+	public int getListenerCount()
+	{
+		return mListeners.size();
+	}
+	
+	public List<Listener<T>> getListeners()
+	{
+		return mListeners;
+	}
+	
+	public void addListener( Listener<T> listener )
+	{
+	    if(listener == null)
+        {
+            throw new IllegalArgumentException("Listener cannot be null");
+        }
+
+		mListeners.add( listener );
+	}
+	
+	public void removeListener( Listener<T> listener )
+	{
+		mListeners.remove( listener );
+	}
+	
+	public void clear()
+	{
+		mListeners.clear();
+	}
+
+    public void broadcast( T t )
+    {
+    	for( Listener<T> listener: mListeners )
+    	{
+    		listener.receive( t );
+    	}
+    }
+}