Platform independent temporary directory name in ApplicationArchiveTest

ApplicationArchiveTest uses "/tmp/app-junit" as temporary directory. This directory name is not appropriate for Windows. The name is intepreted as "c:\tmp\app-junit" on Windows. Since it is not default location of temporary file, it may fail to create the directory if the user doesn't have permission.
In Java, 'java.io.tmpdir' property, which represents default temporary directory name, should be used. File.seprartor also should be used instead of '/'.