potential generalized modeling of campaigns, content, etc.#4

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jesteria wants to merge 2 commits intoef-api-modelsfrom

generalized-campaigns

Commits on Mar 17, 2015

potential generalized modeling of campaigns, content, etc.
jesteria
committed

Commits on Mar 20, 2015

removed `campaigns` table once and for all(?!), removed `vehicle_owners`, and beefed up `content_vehicles`
jesteria
committed