Per @mlucy, use `boost::optional` instead of my -1 hack.
Per @mlucy, use `boost::optional` instead of my -1 hack.

gavioto/rethinkdb,Qinusty/rethinkdb,losywee/rethinkdb,wkennington/rethinkdb,rrampage/rethinkdb,losywee/rethinkdb,rrampage/rethinkdb,Wilbeibi/rethinkdb,spblightadv/rethinkdb,wkennington/rethinkdb,pap/rethinkdb,jmptrader/rethinkdb,JackieXie168/rethinkdb,tempbottle/rethinkdb,urandu/rethinkdb,dparnell/rethinkdb,bpradipt/rethinkdb,robertjpayne/rethinkdb,sbusso/rethinkdb,jmptrader/rethinkdb,AntouanK/rethinkdb,greyhwndz/rethinkdb,pap/rethinkdb,sontek/rethinkdb,sbusso/rethinkdb,marshall007/rethinkdb,RubenKelevra/rethinkdb,victorbriz/rethinkdb,marshall007/rethinkdb,Qinusty/rethinkdb,rrampage/rethinkdb,victorbriz/rethinkdb,sontek/rethinkdb,4talesa/rethinkdb,mquandalle/rethinkdb,greyhwndz/rethinkdb,yakovenkodenis/rethinkdb,scripni/rethinkdb,wojons/rethinkdb,alash3al/rethinkdb,alash3al/rethinkdb,yakovenkodenis/rethinkdb,dparnell/rethinkdb,AntouanK/rethinkdb,spblightadv/rethinkdb,dparnell/rethinkdb,greyhwndz/rethinkdb,AntouanK/rethinkdb,grandquista/rethinkdb,yakovenkodenis/rethinkdb,ayumilong/rethinkdb,JackieXie168/rethinkdb,bchavez/rethinkdb,losywee/rethinkdb,robertjpayne/rethinkdb,greyhwndz/rethinkdb,losywee/rethinkdb,sebadiaz/rethinkdb,KSanthanam/rethinkdb,Wilbeibi/rethinkdb,spblightadv/rethinkdb,jesseditson/rethinkdb,scripni/rethinkdb,Qinusty/rethinkdb,alash3al/rethinkdb,jesseditson/rethinkdb,dparnell/rethinkdb,JackieXie168/rethinkdb,tempbottle/rethinkdb,JackieXie168/rethinkdb,spblightadv/rethinkdb,grandquista/rethinkdb,grandquista/rethinkdb,tempbottle/rethinkdb,bchavez/rethinkdb,mcanthony/rethinkdb,KSanthanam/rethinkdb,eliangidoni/rethinkdb,Wilbeibi/rethinkdb,pap/rethinkdb,sbusso/rethinkdb,rrampage/rethinkdb,jesseditson/rethinkdb,jesseditson/rethinkdb,matthaywardwebdesign/rethinkdb,robertjpayne/rethinkdb,captainpete/rethinkdb,victorbriz/rethinkdb,dparnell/rethinkdb,losywee/rethinkdb,Qinusty/rethinkdb,RubenKelevra/rethinkdb,niieani/rethinkdb,KSanthanam/rethinkdb,robertjpayne/rethinkdb,captainpete/rethinkdb,ajose01/rethinkdb,Wilbeibi/rethinkdb,grandquista/rethinkdb,yaolinz/rethinkdb,AntouanK/rethinkdb,spblightadv/rethinkdb,bpradipt/rethinkdb,yaolinz/rethinkdb,mbroadst/rethinkdb,captainpete/rethinkdb,mquandalle/rethinkdb,matthaywardwebdesign/rethinkdb,robertjpayne/rethinkdb,yaolinz/rethinkdb,wkennington/rethinkdb,niieani/rethinkdb,elkingtonmcb/rethinkdb,losywee/rethinkdb,yakovenkodenis/rethinkdb,pap/rethinkdb,robertjpayne/rethinkdb,RubenKelevra/rethinkdb,yakovenkodenis/rethinkdb,grandquista/rethinkdb,lenstr/rethinkdb,captainpete/rethinkdb,mbroadst/rethinkdb,alash3al/rethinkdb,dparnell/rethinkdb,ajose01/rethinkdb,mcanthony/rethinkdb,yaolinz/rethinkdb,rrampage/rethinkdb,4talesa/rethinkdb,robertjpayne/rethinkdb,pap/rethinkdb,wojons/rethinkdb,niieani/rethinkdb,losywee/rethinkdb,KSanthanam/rethinkdb,ajose01/rethinkdb,RubenKelevra/rethinkdb,mquandalle/rethinkdb,urandu/rethinkdb,ayumilong/rethinkdb,wojons/rethinkdb,jesseditson/rethinkdb,niieani/rethinkdb,urandu/rethinkdb,bpradipt/rethinkdb,jmptrader/rethinkdb,urandu/rethinkdb,sebadiaz/rethinkdb,eliangidoni/rethinkdb,sontek/rethinkdb,KSanthanam/rethinkdb,victorbriz/rethinkdb,eliangidoni/rethinkdb,spblightadv/rethinkdb,jmptrader/rethinkdb,4talesa/rethinkdb,mcanthony/rethinkdb,elkingtonmcb/rethinkdb,gavioto/rethinkdb,Qinusty/rethinkdb,KSanthanam/rethinkdb,captainpete/rethinkdb,wkennington/rethinkdb,catroot/rethinkdb,catroot/rethinkdb,rrampage/rethinkdb,sebadiaz/rethinkdb,jmptrader/rethinkdb,sbusso/rethinkdb,mcanthony/rethinkdb,ajose01/rethinkdb,alash3al/rethinkdb,sebadiaz/rethinkdb,mbroadst/rethinkdb,matthaywardwebdesign/rethinkdb,tempbottle/rethinkdb,alash3al/rethinkdb,bchavez/rethinkdb,scripni/rethinkdb,eliangidoni/rethinkdb,alash3al/rethinkdb,gavioto/rethinkdb,greyhwndz/rethinkdb,ayumilong/rethinkdb,ayumilong/rethinkdb,victorbriz/rethinkdb,urandu/rethinkdb,bchavez/rethinkdb,Wilbeibi/rethinkdb,mquandalle/rethinkdb,lenstr/rethinkdb,JackieXie168/rethinkdb,scripni/rethinkdb,wkennington/rethinkdb,eliangidoni/rethinkdb,scripni/rethinkdb,bpradipt/rethinkdb,sontek/rethinkdb,catroot/rethinkdb,gavioto/rethinkdb,sebadiaz/rethinkdb,RubenKelevra/rethinkdb,alash3al/rethinkdb,spblightadv/rethinkdb,niieani/rethinkdb,Wilbeibi/rethinkdb,dparnell/rethinkdb,elkingtonmcb/rethinkdb,mquandalle/rethinkdb,yaolinz/rethinkdb,jesseditson/rethinkdb,elkingtonmcb/rethinkdb,wojons/rethinkdb,eliangidoni/rethinkdb,catroot/rethinkdb,marshall007/rethinkdb,Qinusty/rethinkdb,lenstr/rethinkdb,yaolinz/rethinkdb,wojons/rethinkdb,KSanthanam/rethinkdb,4talesa/rethinkdb,ayumilong/rethinkdb,4talesa/rethinkdb,bchavez/rethinkdb,sbusso/rethinkdb,niieani/rethinkdb,gavioto/rethinkdb,JackieXie168/rethinkdb,mbroadst/rethinkdb,captainpete/rethinkdb,jesseditson/rethinkdb,sontek/rethinkdb,Qinusty/rethinkdb,JackieXie168/rethinkdb,KSanthanam/rethinkdb,mcanthony/rethinkdb,pap/rethinkdb,mquandalle/rethinkdb,ayumilong/rethinkdb,bchavez/rethinkdb,lenstr/rethinkdb,4talesa/rethinkdb,catroot/rethinkdb,matthaywardwebdesign/rethinkdb,mcanthony/rethinkdb,AntouanK/rethinkdb,elkingtonmcb/rethinkdb,Qinusty/rethinkdb,sontek/rethinkdb,wojons/ret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