null pointer exception when calling setManufacturer with filename fixed

java doc updates
new test for many read/write operations

git-svn-id: https://svn.code.sf.net/p/libusbjava/code/trunk@271 94ad28fe-ef68-46b1-9651-e7ae4fcf1c4c

java/build.xml

@@ -60,7 +60,7 @@
 
 	<target name="javadoc" description="--> Create Javadoc">
 		<javadoc destdir="${project.dir.doc}" encoding="iso-8859-1">
-			<fileset dir="${project.dir.src}" defaultexcludes="yes" />
+			<fileset dir="${project.dir.src}" includes="**/*.java" />
 		</javadoc>
 	</target>
 </project>