Added father_alive field to Orphan model

OSRA-221 #code-review
Merge pull request #143 from motasem-salem/is_father_dead

Added father_alive field to Orphan model
OSRA-221 OSRA-222 #resolve
Removed all hardcoded gender strings and put them in yaml config file
Added failing feature
Implemented gender filter for Orphans

OSRA-204#Code-Review
code review
Code review
Merge pull request #144 from NikitaAvvakumov/orphan_gender_filter

OSRA-204 #Resolved