1.5.0

Lots of nice changes

• implemented a beautiful command line interface (try nqueensfaf-1.5.0-cli.jar)
• now it's possible to use multiple GPUs at the same time
• easily configure, how the workload should be distributed to all used GPUs
• configuration made simple by using a json file or creating a Config-Object in code
  -> have a look at the config-example.json, you can play with the settings (see also Config.java)
• storing and restoring now much cleaner implemented, also using json format