Towards building jlibusb with gradle

* rename package ch.ntb.inf.libusbJava to ch.ntb.usb/Device.java
* separate main, app, test and demo source files
* reorganise static library files
* add prebuilt libraries for testing purposes
* move auxiliary files to appropriate directories
* remove obsolete files

src/main/java/ch/ntb/usb/USBException.java

@@ -0,0 +1,23 @@
+/* 
+ * Java libusb wrapper
+ * Copyright (c) 2005-2006 Andreas Schl<68>pfer <spandi at users.sourceforge.net>
+ *
+ * http://libusbjava.sourceforge.net
+ * This library is covered by the LGPL, read LGPL.txt for details.
+ */
+package ch.ntb.usb;
+
+import java.io.IOException;
+
+public class USBException extends IOException {
+
+	public USBException(String string) {
+		super(string);
+	}
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1690857437804284710L;
+
+}