guess person last name if not defined
no deceased people in generated envlope greeting
update envelope_greeting logic
fix specs
small tweaks in envelope greeting logic
remove nickname from envolope_greeting
Merge pull request #215 from CruGlobal/improve-envelope-greeting

Improve envelope greeting
Merge branch 'master' of https://github.com/CruGlobal/mpdx into MPDX-186-find-duplicates
Changed text prompt for find duplicates