Fixing the phone number fields to allow without country code and without area code if necessary.
1. Open the home.html page
2. Replace verifyPhone with isValidNumber function.
  (a) This new function takes three arguments country area and phone which represent the three fields for the phone number.
  (b) Use pattern attribute for these to create a regular expression to match against.
  (c) Return the result of checking all the current values of the fields against the regular expressions.
3. Create a validatePhone function that reads in phone elements from the form, checks if valid number and returns true if it is valid or it is blank and requirePhone flag is unset.
4. Within gatherDetails method, assign an error if validatePhone() method returns false