Improve nginx dialogs in whiptail, fix dig problem (#27)
Improve nginx dialogs in whiptail, fix dig problem (#27)

- User input is now done by whiptail.
- A confirmation of settings chosen is presented before any changes are
made.
- dig retrieves the last IP in it's lookup. Which should solve problems
for CNAME > IP routes
openhab/openhabian,ThomDietrich/openhabian,openhab/openhabian,openhab/openhabian