Follow symlinks in NioFiles.copy

Make copying using NIO and legacy IO consistent with respect to
following symlinks in source.

Fixes: codehaus-plexus#45

src/main/java/org/codehaus/plexus/util/NioFiles.java

@@ -138,7 +138,7 @@ public static File copy( File source, File target )
         throws IOException
     {
         Path copy = Files.copy( source.toPath(), target.toPath(), StandardCopyOption.REPLACE_EXISTING,
-                                StandardCopyOption.COPY_ATTRIBUTES, LinkOption.NOFOLLOW_LINKS );
+                                StandardCopyOption.COPY_ATTRIBUTES );
         return copy.toFile();
     }