Refactored FileUtils.

Removed methods that are no longer needed for Java 6, moved the remaining method into the utils directory.

briar-core/src/org/briarproject/util/FileUtils.java

@@ -0,0 +1,15 @@
+package org.briarproject.util;
+
+import java.io.File;
+
+public class FileUtils {
+
+	public static void deleteFileOrDir(File f) {
+		if (f.isFile()) {
+			f.delete();
+		} else if (f.isDirectory()) {
+			for (File child : f.listFiles()) deleteFileOrDir(child);
+			f.delete();
+		}
+	}
+}