Anon Name Feature

This code will allow admins to have anonymous users include names. Admins are able to enable/disable this feature in the backend -> DW Q&A -> settings. However, anonymous users will be required to enter a name, 3-15 characters, no symbols, if enabled.

This feature is free to add. The only thing I require is fair representation with my details as, metrocitizen(Joshua Alday);joshua@metroworks.co.jp
Look forward to working more on this in the near future.

If any other features are required for this addon, please let me know so I can work on it.

Additional: added text in 'dw-questions-answer.php' will need to be translated and added into the .po files. If someone would like to do this, that would be awesome! If not, then I'll try to supply .po files a bit later when I can afford the time.

Best Regards,
Metrocitizen(Joshua)