Initial skeleton for USSD menus
Working code for first two screens, tests are failing though
Fixed tests and completed welcome don't know and month due don't know loops.
Fixing long lines and missing eof newlines
More new line additions and restyling the choice array creation
Newlines didn't take before
Merge pull request #1 from praekelt/feature/t-1-unregistered-greeting

Feature/t 1 unregistered greeting