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/complex/ComplexBuffer.java

@@ -0,0 +1,26 @@
+package io.github.dsheirer.sample.complex;
+
+import io.github.dsheirer.sample.Buffer;
+
+import java.util.Arrays;
+
+public class ComplexBuffer extends Buffer
+{
+	/**
+	 * Wrapper around float array containing interleaved I/Q samples
+	 */
+	public ComplexBuffer( float[] samples )
+	{
+		super( samples );
+	}
+
+	/**
+	 * Creates a deep copy of the buffer
+	 */
+	public ComplexBuffer copyOf()
+	{
+		float[] copy = Arrays.copyOf( mSamples, mSamples.length );
+		
+		return new ComplexBuffer( copy );
+	}
+}