ensure organization company name is unique by appending serial num to faker

https://osraav.atlassian.net/browse/OSRA-253
OSRA-253 #code-review
add unique indexes to tables columns that require unique values

https://osraav.atlassian.net/browse/OSRA-252
OSRA-252 #code-review
Modify user show to display active & inactive sponsors separately; implement Sponsor scopes; OSRA-257
Failing scenario for display of actively sponsored orphans only; OSRA-257
Implement Sponsor#currently_sponsored_orphans; OSRA-257
Define User#active_sponsors & #inactive_sponsors; refactor show view to use new methods; OSRA-257
Add number of assigned active sponsors to User index view; OSRA-257
Refactor steps definitions for robustness; use more expressive element ids in views; OSRA-257
Refactor user show view to use new methods; add tests for panel titles to users.feature; improve step definition in users_steps; OSRA-257
Merge pull request #156 from NikitaAvvakumov/modify_agent_show_view

Modify agent show view
OSRA-257 #resolve
Merge pull request #157 from PurityControl/factories

OSRA-253 #Resolved
Merge pull request #158 from PurityControl/db_indexes

Sold!
OSRA-252 #Resolved