move model-specific initializer methods from initializer.rb to models

OSRA-152 #Code-Review
renamed methods for clarity after code review

OSRA-152 #Code-Review #comment renamed methods after code review
Merge pull request #62 from PurityControl/initializer_refactor

OSRA-152 #resolve xxxxxx #comment xxxxxxxx
Sponsor eligibility validation working, Orphan not yet
In progress
Eligibility validations working, specs refactored
Add test for eligibility to orphan_spec