Fix  for "Could not jarsign apkFilename, used this command: jarsigner" on Windows systems

Added FileInputStream close after copying instrumented apk for resign. Without that, jarsigner couldn't copy signed apk to temp file for upload (error was shown: Could not jarsign apkFilename, used this command: jarsigner...). Tested on 64bit Windows 7 system.

If there are other workarounds, please provide me one.