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/instrument/Instrumentable.java

@@ -0,0 +1,54 @@
+/*******************************************************************************
+ *     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.instrument;
+
+import io.github.dsheirer.instrument.tap.Tap;
+import io.github.dsheirer.instrument.tap.TapGroup;
+
+import java.util.List;
+
+/**
+ * Interface for classes that want to expose internal data, streams or events 
+ * to external listeners.
+ */
+public interface Instrumentable
+{
+	/**
+	 * Returns the list of available tap point groups.  Use the addTap() and
+	 * removeTap() to register a tap on the instrumentable class and then add
+	 * your TapListener(s) to the registered tap.
+	 */
+	public List<TapGroup> getTapGroups();
+
+	/**
+	 * Registers a tap on the instrumentable object.
+	 * 
+	 * @param tap - one of the tap(s) obtained from getTaps() from the 
+	 * instrumentable source
+	 */
+	public void registerTap( Tap tap );
+
+	/**
+	 * Unregisters a tap on the instrumentable object, if the tap is currently
+	 * registered.
+	 * 
+	 * @param tap - one of the tap(s) obtained from getTaps() from the 
+	 * instrumentable source
+	 */
+	public void unregisterTap( Tap tap );
+}