Create Sponsorship table and link Sponsors & Orphans through Sponsorship
Create Sponsorship & SponsorshipStatus factories & model specs
Improve sponsorship_status factory & sponsorship_spec
Add SponsorshipStatus to seeds.db; set Sponsorship status to Active on initialize; fix copy-paste error in sponsor_spec
Add index to SponsorshipStatus.name; remove start_date from Sponsorship factory
Merge pull request #37 from NikitaAvvakumov/sponsorship_models

Sponsorship models