Add missing indexes to foreign keys
Merge pull request #161 from NikitaAvvakumov/foreign_key_indexes

Add missing indexes to foreign keys
OSRA-260 #resolve
factory & seeds: enlarge & diversify for testing
write steps
write failing tests
rerouted new Sponsorship to Orphan class, all tests passing
add more failing model tests
new model tests passing
refactor; all tests passing
fix bug in unit test
clean up tests
remove unneccessary view
add failing tests for filtering; remove custom route (bugfix)
update test to remove a feature currently being added to active admin
most tests passing
all tests passing
update routing spec
code review: moved custom scopes to models
unordered arrays can be equal; bug
code review: reduce dev seeds