Added text for the negative state of a TTY number

Previously, when adding a phone number, you had the choice of setting
the phone type to a blank line or "TTY". We have clarified this by
changing the choices to "Not a TTY number" or "TTY number". The values
set are the same as previously.
Fixed specs to match new TTY text
Merge PR #196.
Merge branch 'cndreisbach-issue-196'