ruby: remove duplication in request methods, and make params uniform
ruby: remove duplication in request methods, and make params uniform

mgoffin/ThreatExchange,RyPeck/ThreatExchange,mgoffin/ThreatExchange,tiegz/ThreatExchange,wxsBSD/ThreatExchange,mgoffin/ThreatExchange,mgoffin/ThreatExchange,RyPeck/ThreatExchange,wxsBSD/ThreatExchange,tiegz/ThreatExchange,RyPeck/ThreatExchange,mgoffin/ThreatExchange,wxsBSD/ThreatExchange,RyPeck/ThreatExchange,mgoffin/ThreatExchange,wxsBSD/ThreatExchange,tiegz/ThreatExchange,RyPeck/ThreatExchange,wxsBSD/ThreatExchange,RyPeck/ThreatExchange,tiegz/ThreatExchange,tiegz/ThreatExchange,tiegz/ThreatExchange,wxsBSD/ThreatExchange