add leveldb cache backend docs
add leveldb cache backend docs

wzyuliyang/scrapy,mgedmin/scrapy,jorik041/scrapy,beni55/scrapy,CodeJuan/scrapy,ArturGaspar/scrapy,eLRuLL/scrapy,ssteo/scrapy,rootAvish/scrapy,nfunato/scrapy,aivarsk/scrapy,kazitanvirahsan/scrapy,starrify/scrapy,fpy171/scrapy,rootAvish/scrapy,dracony/scrapy,URXtech/scrapy,bmess/scrapy,ramiro/scrapy,cursesun/scrapy,rdowinton/scrapy,cursesun/scrapy,godfreyy/scrapy,crasker/scrapy,huoxudong125/scrapy,fqul/scrapy,cyrixhero/scrapy,nikgr95/scrapy,zhangtao11/scrapy,johnardavies/scrapy,agreen/scrapy,rolando-contrib/scrapy,scorphus/scrapy,cursesun/scrapy,hbwzhsh/scrapy,zorojean/scrapy,tliber/scrapy,rootAvish/scrapy,moraesnicol/scrapy,dracony/scrapy,lacrazyboy/scrapy,zhangtao11/scrapy,starrify/scrapy,dangra/scrapy,elijah513/scrapy,pombredanne/scrapy,rklabs/scrapy,wujuguang/scrapy,jiezhu2007/scrapy,dhenyjarasandy/scrapy,KublaikhanGeek/scrapy,rahulsharma1991/scrapy,Lucifer-Kim/scrapy,taito/scrapy,jeffreyjinfeng/scrapy,YeelerG/scrapy,hyrole/scrapy,hansenDise/scrapy,ArturGaspar/scrapy,coderabhishek/scrapy,jeffreyjinfeng/scrapy,yusofm/scrapy,Cnfc19932/scrapy,WilliamKinaan/scrapy,beni55/scrapy,redapple/scrapy,yusofm/scrapy,johnardavies/scrapy,agusc/scrapy,ylcolala/scrapy,livepy/scrapy,hwsyy/scrapy,eLRuLL/scrapy,scrapy/scrapy,codebhendi/scrapy,profjrr/scrapy,Timeship/scrapy,YeelerG/scrapy,mgedmin/scrapy,codebhendi/scrapy,mlyundin/scrapy,fontenele/scrapy,z-fork/scrapy,rolando/scrapy,ENjOyAbLE1991/scrapy,ashishnerkar1/scrapy,tntC4stl3/scrapy,pranjalpatil/scrapy,yidongliu/scrapy,Parlin-Galanodel/scrapy,kalessin/scrapy,jiezhu2007/scrapy,jdemaeyer/scrapy,pfctdayelise/scrapy,IvanGavran/scrapy,Partoo/scrapy,amboxer21/scrapy,yidongliu/scrapy,KublaikhanGeek/scrapy,Parlin-Galanodel/scrapy,famorted/scrapy,csalazar/scrapy,Allianzcortex/scrapy,dgillis/scrapy,snowdream1314/scrapy,barraponto/scrapy,URXtech/scrapy,irwinlove/scrapy,devGregA/scrapy,OpenWhere/scrapy,legendtkl/scrapy,Zephor5/scrapy,CodeJuan/scrapy,hansenDise/scrapy,KublaikhanGeek/scrapy,nowopen/scrapy,yarikoptic/scrapy,rklabs/scrapy,arush0311/scrapy,zackslash/scrapy,avtoritet/scrapy,eLRuLL/scrapy,snowdream1314/scrapy,elacuesta/scrapy,dangra/scrapy,Digenis/scrapy,crasker/scrapy,godfreyy/scrapy,farhan0581/scrapy,zorojean/scrapy,JacobStevenR/scrapy,stenskjaer/scrapy,tliber/scrapy,csalazar/scrapy,fafaman/scrapy,Geeglee/scrapy,hyrole/scrapy,dhenyjarasandy/scrapy,WilliamKinaan/scrapy,umrashrf/scrapy,olorz/scrapy,huoxudong125/scrapy,avtoritet/scrapy,darkrho/scrapy-scrapy,Djlavoy/scrapy,coderabhishek/scrapy,hectoruelo/scrapy,mlyundin/scrapy,CodeJuan/scrapy,Djlavoy/scrapy,Chenmxs/scrapy,Digenis/scrapy,farhan0581/scrapy,WilliamKinaan/scrapy,songfj/scrapy,zorojean/scrapy,nguyenhongson03/scrapy,nowopen/scrapy,wzyuliyang/scrapy,jamesblunt/scrapy,barraponto/scrapy,nfunato/scrapy,cleydson/scrapy,fafaman/scrapy,ylcolala/scrapy,Timeship/scrapy,Chenmxs/scrapy,zackslash/scrapy,finfish/scrapy,wenyu1001/scrapy,smaty1/scrapy,jeffreyjinfeng/scrapy,smaty1/scrapy,dacjames/scrapy,z-fork/scrapy,barraponto/scrapy,eliasdorneles/scrapy,wangjun/scrapy,taito/scrapy,Ryezhang/scrapy,agreen/scrapy,Lucifer-Kim/scrapy,scrapy/scrapy,tagatac/scrapy,zackslash/scrapy,nikgr95/scrapy,devGregA/scrapy,wangjun/scrapy,ramiro/scrapy,kazitanvirahsan/scrapy,tntC4stl3/scrapy,zjuwangg/scrapy,xiao26/scrapy,jdemaeyer/scrapy,nguyenhongson03/scrapy,github-account-because-they-want-it/scrapy,tliber/scrapy,OpenWhere/scrapy,Zephor5/scrapy,gbirke/scrapy,rolando/scrapy,ssteo/scrapy,Allianzcortex/scrapy,legendtkl/scrapy,ENjOyAbLE1991/scrapy,kmike/scrapy,Zephor5/scrapy,fqul/scrapy,pranjalpatil/scrapy,dacjames/scrapy,kmike/scrapy,w495/scrapy,redapple/scrapy,scorphus/scrapy,Partoo/scrapy,Chenmxs/scrapy,beni55/scrapy,olafdietsche/scrapy,elijah513/scrapy,farhan0581/scrapy,codebhendi/scrapy,umrashrf/scrapy,JacobStevenR/scrapy,finfish/scrapy,AaronTao1990/scrapy,zhangtao11/scrapy,TarasRudnyk/scrapy,elacuesta/scrapy,YeelerG/scrapy,profjrr/scrapy,jc0n/scrapy,stenskjaer/scrapy,Adai0808/scrapy-1,umrashrf/scrapy,elacuesta/scrapy,yusofm/scrapy,pablohoffman/scrapy,TarasRudnyk/scrapy,GregoryVigoTorres/scrapy,OpenWhere/scrapy,sigma-random/scrapy,olorz/scrapy,kalessin/scrapy,foromer4/scrapy,agreen/scrapy,mlyundin/scrapy,CENDARI/scrapy,pfctdayelise/scrapy,GregoryVigoTorres/scrapy,Bourneer/scrapy,finfish/scrapy,eliasdorneles/scrapy,moraesnicol/scrapy,johnardavies/scrapy,cyrixhero/scrapy,AaronTao1990/scrapy,rdowinton/scrapy,famorted/scrapy,xiao26/scrapy,darkrho/scrapy-scrapy,Preetwinder/scrapy,Allianzcortex/scrapy,wangjun/scrapy,livepy/scrapy,Timeship/scrapy,Geeglee/scrapy,webmakin/scrapy,wujuguang/scrapy,hectoruelo/scrapy,coderabhishek/scrapy,GregoryVigoTorres/scrapy,shaform/scrapy,jc0n/scrapy,irwinlove/scrapy,ashishnerkar1/scrapy,haiiiiiyun/scrapy,tntC4stl3/scrapy,Lucifer-Kim/scrapy,raphaelfruneaux/scrapy,gbirke/scrapy,kashyap32/scrapy,arush0311/scrapy,Slater-Victoroff/scrapy,fpy171/scrapy,devGregA/scrapy,jdemaeyer/scrapy,curita/scrapy,cleydson/scrapy,JacobStevenR/scrapy,rahulsharma1991/scrapy,w495/scrapy,livepy/scrapy,curita/scrapy,pranjalpatil/scrapy,ENjOyAbLE1991/scrapy,olafdietsche/scrapy,cleydson/scrapy,github-account-because-they-want-it/scrapy,IvanGavran/scrapy,snowdream1314/scrapy,1yvT0s/scrapy,jamesblunt/scrapy,rahulsharma1991/scrapy,jiezhu2007/scrapy,Djlavoy/scrapy,TarasRudnyk/scrapy,godfreyy/scrapy,hwsyy/scrapy,bmess/scrapy,olafdietsche/scrapy,Geeglee/scrapy,fqul/scrapy,pawelmhm/scrapy,chekunkov/scrapy,songfj/scrapy,crasker/scrapy,Ryezhang/scrapy,agusc/scrapy,lacrazyboy/scrapy,fafaman/scrapy,pawelmhm/scrapy,olorz/scrapy,carlosp420/scrapy,jorik041/scrapy,kalessin/scrapy,rolando-contrib/scrapy,cyberplant/scrapy,wenyu1001/scrapy,raphaelfruneaux/scrapy,ArturGaspar/scrapy,zjuwangg/scrapy,fontenele/scrapy,shaform/scrapy,moraesnicol/scrapy,carlosp420/scrapy,hbwzhsh/scrapy,1yvT0s/scrapy,amboxer21/scrapy,amboxer21/scrapy,huoxudong125/scrapy,z-fork/scrapy,redapple/scrapy,wzyuliyang/scrapy,ssh-odoo/scrapy,tagatac/scrapy,Ryezhang/scrapy,aivarsk/scrapy,dracony/scrapy,liyy7/scrapy,rolando-contrib/scrapy,curita/scrapy,w495/scrapy,jorik041/scrapy,Digenis/scrapy,CENDARI/scrapy,hectoruelo/scrapy,pombredanne/scrapy,scorphus/scrapy,pombredanne/scrapy,Cnfc19932/scrapy,taito/scrapy,nfunato/scrapy,aivarsk/scrapy,raphaelfruneaux/scrapy,IvanGavran/scrapy,rklabs/scrapy,webmakin/scrapy,ssh-odoo/scrapy,AaronTao1990/scrapy,xiao26/scrapy,avtoritet/scrapy,pablohoffman/scrapy,1yvT0s/scrapy,nowopen/scrapy,cyberplant/scrapy,Parlin-Galanodel/scrapy,haiiiiiyun/scrapy,sigma-random/scrapy,eliasdorneles/scrapy,scrapy/scrapy,yidongliu/scrapy,liyy7/scrapy,smaty1/scrapy,Adai0808/scrapy-1,cyberplant/scrapy,kazitanvirahsan/scrapy,chekunkov/scrapy,legendtkl/scrapy,Adai0808/scrapy-1,dgillis/scrapy,cyrixhero/scrapy,yarikoptic/scrapy,agusc/scrapy,tagatac/scrapy,hansenDise/scrapy,wujuguang/scrapy,kimimj/scrapy,Preetwinder/scrapy,heamon7/scrapy,Preetwinder/scrapy,yarikoptic/scrapy,dacjames/scrapy,liyy7/scrapy,Bourneer/scrapy,Partoo/scrapy,carlosp420/scrapy,kimimj/scrapy,ramiro/scrapy,elijah513/scrapy,arush0311/scrapy,github-account-because-they-want-it/scrapy,kimimj/scrapy,heamon7/scrapy,songfj/scrapy,mgedmin/scrapy,profjrr/scrapy,nikgr95/scrapy,shaform/scrapy,ylcolala/scrapy,wenyu1001/scrapy,fontenele/scrapy,Slater-Victoroff/scrapy,rdowinton/scrapy,CENDARI/scrapy,dhenyjarasandy/scrapy,webmakin/scrapy,nguyenhongson03/scrapy,hbwzhsh/scrapy,dangra/scrapy,rolando/scrapy,hyrole/scrapy,pawelmhm/scrapy,csalazar/scrapy,pfctdayelise/scrapy,Cnfc19932/scrapy,foromer4/scrapy,Bourneer/scrapy,bmess/scrapy,darkrho/scrapy-scrapy,haiiiiiyun/scrapy,kashyap32/scrapy,pablohoffman/scrapy,kmike/scrapy,stenskjaer/scrapy,foromer4/scrapy,kashyap32/scrapy,hwsyy/scrapy,chekunkov/scrapy,ssteo/scrapy,ssh-odoo/scrapy,URXtech/scrapy,Slater-Victoroff/scrapy,irwinlove/scrapy,starrify/scrapy,zjuwangg/scrapy,famorted/scrapy,heamon7/scrapy,jc0n/scrapy,fpy171/scrapy,dgillis/scrapy,lacrazyboy/scrapy