ticket 2073: add simple test for method IO.copyDirectory()

[flybyray]

#1075 testing

ok it works only with java.nio.Files https://stackoverflow.com/a/21987929

The Problem in the test is the Ü Character in the filename.
On Windows for example the utf-8 string will translate to Ãœ when accessing the file system.

INFORMATION: cp1252: C:\dev\src\github.com\playframework\play1\framework\test-classes\play\libs\Anhang Performance-Bericht_ Übersicht §18 Bundesbank gesetz Meldepflichten.PDF
Jul 04, 2017 5:03:31 AM play.Logger info
INFORMATION: cp1252: C:\dev\src\github.com\playframework\play1\framework\test-classes\play\libs\Anhang Performance-Bericht_ Übersicht §18 Bundesbank gesetz Meldepflichten.PDF

But if you list the files with java and print it out it will be Ü.

        Path path1 = target.listFiles()[1].toPath().toAbsolutePath();
        String anotherString2 = path1.toString();
        cp1252 = new String(anotherString2.getBytes("UTF-8"), "WINDOWS-1252");

[flybyray]

The best way would be to fix legacy code in the play framework https://play.lighthouseapp.com/projects/57987-play-framework/tickets/2132-replace-legacy-file-io-code