Added single_threaded_shared_mixin_t (for use with intrusive_ptr_t).
Added single_threaded_shared_mixin_t (for use with intrusive_ptr_t).

bpradipt/rethinkdb,ayumilong/rethinkdb,jesseditson/rethinkdb,spblightadv/rethinkdb,AntouanK/rethinkdb,pap/rethinkdb,sontek/rethinkdb,wkennington/rethinkdb,jmptrader/rethinkdb,gavioto/rethinkdb,captainpete/rethinkdb,jesseditson/rethinkdb,ajose01/rethinkdb,lenstr/rethinkdb,bpradipt/rethinkdb,RubenKelevra/rethinkdb,jmptrader/rethinkdb,spblightadv/rethinkdb,wkennington/rethinkdb,Qinusty/rethinkdb,jmptrader/rethinkdb,4talesa/rethinkdb,losywee/rethinkdb,Wilbeibi/rethinkdb,mbroadst/rethinkdb,dparnell/rethinkdb,catroot/rethinkdb,dparnell/rethinkdb,wujf/rethinkdb,ajose01/rethinkdb,greyhwndz/rethinkdb,greyhwndz/rethinkdb,AntouanK/rethinkdb,tempbottle/rethinkdb,jmptrader/rethinkdb,losywee/rethinkdb,marshall007/rethinkdb,grandquista/rethinkdb,gdi2290/rethinkdb,sebadiaz/rethinkdb,lenstr/rethinkdb,scripni/rethinkdb,RubenKelevra/rethinkdb,eliangidoni/rethinkdb,marshall007/rethinkdb,Wilbeibi/rethinkdb,yaolinz/rethinkdb,sebadiaz/rethinkdb,gdi2290/rethinkdb,wkennington/rethinkdb,jesseditson/rethinkdb,RubenKelevra/rethinkdb,ajose01/rethinkdb,eliangidoni/rethinkdb,yakovenkodenis/rethinkdb,urandu/rethinkdb,pap/rethinkdb,Wilbeibi/rethinkdb,grandquista/rethinkdb,bpradipt/rethinkdb,JackieXie168/rethinkdb,bpradipt/rethinkdb,gdi2290/rethinkdb,grandquista/rethinkdb,sebadiaz/rethinkdb,urandu/rethinkdb,JackieXie168/rethinkdb,bchavez/rethinkdb,rrampage/rethinkdb,ajose01/rethinkdb,mcanthony/rethinkdb,alash3al/rethinkdb,AntouanK/rethinkdb,Wilbeibi/rethinkdb,yakovenkodenis/rethinkdb,Wilbeibi/rethinkdb,bchavez/rethinkdb,4talesa/rethinkdb,greyhwndz/rethinkdb,niieani/rethinkdb,scripni/rethinkdb,urandu/rethinkdb,elkingtonmcb/rethinkdb,pap/rethinkdb,sebadiaz/rethinkdb,mquandalle/rethinkdb,bpradipt/rethinkdb,jesseditson/rethinkdb,matthaywardwebdesign/rethinkdb,sontek/rethinkdb,losywee/rethinkdb,sontek/rethinkdb,niieani/rethinkdb,sbusso/rethinkdb,catroot/rethinkdb,sontek/rethinkdb,KSanthanam/rethinkdb,4talesa/rethinkdb,sebadiaz/rethinkdb,alash3al/rethinkdb,lenstr/rethinkdb,wkennington/rethinkdb,gavioto/rethinkdb,Qinusty/rethinkdb,pap/rethinkdb,matthaywardwebdesign/rethinkdb,spblightadv/rethinkdb,RubenKelevra/rethinkdb,mbroadst/rethinkdb,mcanthony/rethinkdb,bpradipt/rethinkdb,yaolinz/rethinkdb,eliangidoni/rethinkdb,AntouanK/rethinkdb,scripni/rethinkdb,jmptrader/rethinkdb,KSanthanam/rethinkdb,captainpete/rethinkdb,niieani/rethinkdb,tempbottle/rethinkdb,catroot/rethinkdb,jesseditson/rethinkdb,elkingtonmcb/rethinkdb,losywee/rethinkdb,spblightadv/rethinkdb,victorbriz/rethinkdb,matthaywardwebdesign/rethinkdb,dparnell/rethinkdb,rrampage/rethinkdb,jmptrader/rethinkdb,urandu/rethinkdb,ayumilong/rethinkdb,yakovenkodenis/rethinkdb,grandquista/rethinkdb,JackieXie168/rethinkdb,mquandalle/rethinkdb,robertjpayne/rethinkdb,eliangidoni/rethinkdb,rrampage/rethinkdb,mbroadst/rethinkdb,elkingtonmcb/rethinkdb,bchavez/rethinkdb,sbusso/rethinkdb,gavioto/rethinkdb,ajose01/rethinkdb,RubenKelevra/rethinkdb,tempbottle/rethinkdb,yaolinz/rethinkdb,sbusso/rethinkdb,jesseditson/rethinkdb,4talesa/rethinkdb,alash3al/rethinkdb,victorbriz/rethinkdb,mquandalle/rethinkdb,sontek/rethinkdb,robertjpayne/rethinkdb,lenstr/rethinkdb,victorbriz/rethinkdb,tempbottle/rethinkdb,mcanthony/rethinkdb,ajose01/rethinkdb,losywee/rethinkdb,bpradipt/rethinkdb,4talesa/rethinkdb,ayumilong/rethinkdb,elkingtonmcb/rethinkdb,urandu/rethinkdb,catroot/rethinkdb,marshall007/rethinkdb,spblightadv/rethinkdb,tempbottle/rethinkdb,ayumilong/rethinkdb,mbroadst/rethinkdb,mbroadst/rethinkdb,losywee/rethinkdb,dparnell/rethinkdb,AntouanK/rethinkdb,alash3al/rethinkdb,rrampage/rethinkdb,bchavez/rethinkdb,wkennington/rethinkdb,yakovenkodenis/rethinkdb,sontek/rethinkdb,RubenKelevra/rethinkdb,jmptrader/rethinkdb,pap/rethinkdb,yakovenkodenis/rethinkdb,bpradipt/rethinkdb,matthaywardwebdesign/rethinkdb,lenstr/rethinkdb,grandquista/rethinkdb,wujf/rethinkdb,JackieXie168/rethinkdb,gdi2290/rethinkdb,catroot/rethinkdb,yakovenkodenis/rethinkdb,niieani/rethinkdb,bchavez/rethinkdb,AntouanK/rethinkdb,wujf/rethinkdb,urandu/rethinkdb,lenstr/rethinkdb,wujf/rethinkdb,mbroadst/rethinkdb,yaolinz/rethinkdb,wojons/rethinkdb,robertjpayne/rethinkdb,bchavez/rethinkdb,tempbottle/rethinkdb,catroot/rethinkdb,captainpete/rethinkdb,gavioto/rethinkdb,gavioto/rethinkdb,wojons/rethinkdb,victorbriz/rethinkdb,yakovenkodenis/rethinkdb,jesseditson/rethinkdb,spblightadv/rethinkdb,urandu/rethinkdb,urandu/rethinkdb,4talesa/rethinkdb,losywee/rethinkdb,scripni/rethinkdb,jmptrader/rethinkdb,ayumilong/rethinkdb,alash3al/rethinkdb,marshall007/rethinkdb,pap/rethinkdb,KSanthanam/rethinkdb,greyhwndz/rethinkdb,yaolinz/rethinkdb,pap/rethinkdb,Qinusty/rethinkdb,wkennington/rethinkdb,scripni/rethinkdb,gdi2290/rethinkdb,JackieXie168/rethinkdb,sontek/rethinkdb,KSanthanam/rethinkdb,niieani/rethinkdb,rrampage/rethinkdb,catroot/rethinkdb,sebadiaz/rethinkdb,scripni/rethinkdb,ayumilong/rethinkdb,4talesa/rethinkdb,greyhwndz/rethinkdb,robertjpayne/rethinkdb,marshall007/rethinkdb,spblightadv/rethinkdb,yaolinz/rethinkdb,dparnell/rethinkdb,wojons/rethinkdb,mquandalle/rethinkdb,marshall007/rethinkdb,mcanthony/rethinkdb,sbusso/rethinkdb,gdi2290/rethinkdb,mbroadst/rethinkdb,yaolinz/rethinkdb,greyhwndz/rethinkdb,4talesa/rethinkdb,victorbriz/rethinkdb,captainpete/rethinkdb,eliangidoni/rethinkdb,KSanthanam/rethinkdb,scripni/rethinkdb,mquandalle/rethinkdb,pap/rethinkdb,greyhwndz/rethinkdb,niieani/rethinkdb,elkingtonmcb/rethinkdb,eliangidoni/rethinkdb,mquandalle/rethinkdb,matthaywardwebdesign/rethinkdb,Wilbeibi/rethinkdb,gavioto/rethinkdb,victorbriz/rethinkdb,RubenKelevra/rethinkdb,JackieXie168/rethinkdb,sontek/rethinkdb,captainpete/rethinkdb,yaolinz/rethinkdb,sbusso/rethinkdb,elkingtonmcb/rethinkdb,Qinusty/rethinkdb,dparnell/rethinkdb,marshall007/rethinkdb,victorbriz/rethinkdb,matthaywardwebdesign/rethinkdb,KSanthanam/rethinkdb,wojons/rethinkdb,mquandalle/rethinkdb,wojons/rethinkdb,wojons/rethinkdb,grandquista/rethinkdb,spblightadv/rethinkdb,sbusso/rethinkdb,alash3al/rethinkdb,rrampage/rethinkdb,captainpete/rethinkdb,tempbottle/rethinkdb,bchavez/rethinkdb,eliangidoni/rethinkdb,captainpete/rethinkdb,losywee/rethinkdb,wojons/rethinkdb,rrampage/rethinkdb,dparnell/rethinkdb,lenstr/rethinkdb,AntouanK/rethinkdb,ajose01/rethinkdb,robertjpayne/rethinkdb,scripni/rethinkdb,bchavez/rethinkdb,wkennington/rethinkdb,mcanthony/rethinkdb,ayumilong/rethinkdb,dparnell/rethinkdb,captainpete/rethinkdb,Qinusty/rethinkdb,sebadiaz/rethinkdb,wujf/rethinkdb,gavioto/rethinkdb,wujf/rethinkdb,JackieXie168/rethinkdb,Wilbeibi/rethinkdb,sbusso/rethinkdb,elkingtonmcb/rethinkdb,lenstr/rethinkdb,marshall007/rethinkdb,JackieXie168/rethinkdb,yakovenkodenis/rethinkdb,elkingtonmcb/rethinkdb,eliangidoni/rethinkdb,greyhwndz/rethinkdb,robertjpayne/rethinkdb,AntouanK/rethinkdb,Qinusty/rethinkdb,Qinusty/rethinkdb,wujf/rethinkdb,grandquista/rethinkdb,robertjpayne/rethinkdb,matthaywardwebdesign/rethinkdb,matthaywardwebdesign/rethinkdb,robertjpayne/rethinkdb,KSanthanam/rethinkdb,Qinusty/rethinkdb,grandquista/rethinkdb,mquandalle/rethinkdb,jesseditson/rethinkdb,mcanthony/rethinkdb,dparnell/rethinkdb,gdi2290/rethinkdb,Wilbeibi/rethinkdb,victorbriz/rethinkdb,niieani/rethinkdb,robertjpayne/rethinkdb,tempbottle/rethinkdb,RubenKelevra/rethinkdb,bpradipt/rethinkdb,mbroadst/rethinkdb,eliangidoni/rethinkdb,niieani/rethinkdb,grandquista/rethinkdb,mcanthony/rethinkdb,wkennington/rethinkdb,sebadiaz/rethinkdb,alash3al/rethinkdb,rrampage/rethinkdb,mcanthony/rethinkdb,bchavez/rethinkdb,ayumilong/rethinkdb,sbusso/rethinkdb,JackieXie168/rethinkdb,KSanthanam/rethinkdb,alash3al/rethinkdb,Qinusty/rethinkdb,mbroadst/rethinkdb,gavioto/rethinkdb,catroot/rethinkdb,ajose01/rethinkdb,wojons/rethinkdb