Adds docs for pattern matching group_by.
Adds docs for pattern matching group_by.

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