show osra_num in index view in place of id but still link to ids in link
tests and method to return affiliate from sponsor
show affiliate and osra_num in sponsor view
removed 3 columns from organization model / table

part of PT story https://www.pivotaltracker.com/story/show/79157840
- created migration to remove the fields
- cleaned model to represent new state
- made rspec tests match new requirements
- amended the organization factory
- changed features to represent new model
- changed fields shown in active admin views
fixed errors in db schema file
remove unneeded params line from spec model
refactor sponsor_spec grouping related tests within contextx
changed affiliate method form standard conditional to ternary
refactored branch_or_organization tests for clarity
Merge pull request #49 from PurityControl/sponsor_refactor

Sponsor refactor
Merge pull request #52 from PurityControl/org_refactor

removed 3 columns from organization model / table