WIP: Add unit test for reverse backfilling.
WIP: Add unit test for reverse backfilling.

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hinkdb,victorbriz/rethinkdb,niieani/rethinkdb,sbusso/rethinkdb,yaolinz/rethinkdb,AntouanK/rethinkdb,lenstr/rethinkdb,eliangidoni/rethinkdb,niieani/rethinkdb,jmptrader/rethinkdb,RubenKelevra/rethinkdb,matthaywardwebdesign/rethinkdb,eliangidoni/rethinkdb,mquandalle/rethinkdb,sontek/rethinkdb,mbroadst/rethinkdb,matthaywardwebdesign/rethinkdb,grandquista/rethinkdb,robertjpayne/rethinkdb,sebadiaz/rethinkdb,dparnell/rethinkdb,elkingtonmcb/rethinkdb,gavioto/rethinkdb,catroot/rethinkdb,Wilbeibi/rethinkdb,robertjpayne/rethinkdb,pap/rethinkdb,scripni/rethinkdb,eliangidoni/rethinkdb,dparnell/rethinkdb,KSanthanam/rethinkdb,mcanthony/rethinkdb,scripni/rethinkdb,mquandalle/rethinkdb,mcanthony/rethinkdb,Qinusty/rethinkdb,bpradipt/rethinkdb,matthaywardwebdesign/rethinkdb,RubenKelevra/rethinkdb,lenstr/rethinkdb,losywee/rethinkdb,yakovenkodenis/rethinkdb,AntouanK/rethinkdb,victorbriz/rethinkdb,jmptrader/rethinkdb,greyhwndz/rethinkdb,scripni/rethinkdb,wkennington/rethinkdb,robertjpayne/rethinkdb,jmptrader/rethinkdb,robertjpayne/rethinkdb,mcanthony/rethinkdb,dparnell/rethinkdb,eliangidoni/rethinkdb,pap/rethinkdb,captainpete/rethinkdb,sontek/rethinkdb,pap/rethinkdb,KSanthanam/rethinkdb,victorbriz/rethinkdb,grandquista/rethinkdb,Qinusty/rethinkdb,bchavez/rethinkdb,lenstr/rethinkdb,robertjpayne/rethinkdb,losywee/rethinkdb,KSanthanam/rethinkdb,losywee/rethinkdb,bchavez/rethinkdb,AntouanK/rethinkdb,niieani/rethinkdb,pap/rethinkdb,greyhwndz/rethinkdb,Wilbeibi/rethinkdb,mbroadst/rethinkdb,bpradipt/rethinkdb,alash3al/rethinkdb,sbusso/rethinkdb,elkingtonmcb/rethinkdb,catroot/rethinkdb,grandquista/rethinkdb,ajose01/rethinkdb,yaolinz/rethinkdb,JackieXie168/rethinkdb,pap/rethinkdb,ayumilong/rethinkdb,ajose01/rethinkdb,sebadiaz/rethinkdb