Taxicab companies and others seeking statewide regulation of the emerging ridesharing industry pushed for a legislative override Monday after Gov. Patrick J. Quinn vetoed measures that would have imposed background checks and insurance requirements on some drivers. In a statement, Quinn said the two bills would have prevented local governments from adopting rules that fit their communities. “I am vetoing this legislation because it would have mandated a one-size-fits-all approach to a service that is best …