Site#read_data_file: read CSV's with proper file encoding
Site#read_data_file: read CSV's with proper file encoding

Fixes #3451.

dansef/jekyll,jmhardison/jekyll,fengsmith/jekyllcn,isathish/jekyll,honger05/jekyllcn,ryanshaw/jekyll,AtekiRyu/jekyll,julienbourdeau/jekyll,xcatliu/jekyllcn,eninya/jekyll,AaronSikes/jekyll,tareq-s/jekyll,julienbourdeau/jekyll,pmarsceill/jekyll,eninya/jekyll,Strangehill/jekyll,tomjohnson1492/jekyll,LuoPX-15510486969/jekyll,wadaries/jekyll,xtymichael/jekyll,htmelvis/jekyll,shuber2/jekyll,tillgrallert/jekyll,m2candre/jekyll,penchan1218/jekyllcn,xantage/jekyll,cyberid41/jekyll,jaroot32/jekyll,abhilashhb/jekyll,aarvay/jekyll,wentixiaogege/jekyll,hiteshsuthar/jekyll,egobrightan/jekyll,drobati/jekyll,doubleday/jekyll,EddieDow/jekyll,isathish/jekyll,CorainChicago/jekyll,tomjohnson1492/jekyll,fengsmith/jekyll,adilapapaya/jekyll,adilapapaya/jekyll,bsmr-ruby/jekyll,daniel-beck/jekyll,desidude03/jekyll,stomar/jekyll,jmepg/jekyll,thejameskyle/jekyll,dezon/jekyll,LeuisKen/jekyllcn,fengsmith/jekyll,dangaute/eng,royalwang/jekyll,dansef/jekyll,x-way/jekyll,SQS2/Test,richsoni/jekyll,darwin/jekyll,thejameskyle/jekyll,anthonyrosengren/grasshoppergathering2.github-io,xiebinhqy/jklly_china,sanxore/sanxore.github.com,chrisfinazzo/jekyll,indraj/jekyll,floydpraveen/jekyll,royalwang/jekyll,xtymichael/jekyll,matuzo/jekyll,foocoder/jekyll,x-way/jekyll,shuber2/jekyll,digideskio/jekyll,0x00evil/jekyll,sasongkojati/jekyll,bsmr-ruby/jekyll,ducktyper/jekyll,stomar/jekyll,isathish/jekyll,SQS2/Test,AnanthaRajuC/jekyll,alfredxing/jekyll,omeripek/jekyll,thejameskyle/jekyll,0x00evil/jekyll,ajhit406/jekyll,gynter/jekyll,jmepg/jekyll,naughtyboy83/jekyll,supriyantomaftuh/jekyll,jeffkole/jekyll,thetaxman/jekyll,rebornix/jekyll,egobrightan/jekyll,pmarsceill/jekyll,trungvothanh/jekyll,brint/jekyll,zsyed91/jekyll,alfredxing/jekyll,x-way/jekyll,kuangyeheng/jekyll,liukaijv/jekyll,derekgottlieb/jekyll,codeclimate-testing/jekyll,Tyrion22/jekyll,rebornix/jekyll,matuzo/jekyll,thetaxman/jekyll,AaronSikes/jekyll,chrisfinazzo/jekyll,noikiy/jekyll,zhangkuaiji/jekyllcn,alex-kovac/jekyll,chrisfinazzo/jekyll,liukaijv/jekyll,chiyodad/jekyll,hiteshsuthar/jekyll,MjAbuz/jekyll,ramoslin02/jekyll,hubsaysnuaa/jekyll,xiaoshaozi52/jekyll,FlyingWHR/jekyll,AnanthaRajuC/jekyll,christophermanning/jekyll,wadaries/jekyll,marrujoalex/jekyll,rlugojr/jekyll,tylermachen/jekyll,Tiger66639/jekyll,dangaute/eng,krishnakalyan3/jekyll,goragod/jekyll,vidbina/jekyll,AtekiRyu/jekyll,howkj1/jekyll,rongl/jekyll,MjAbuz/jekyll,ajhit406/jekyll,honger05/jekyllcn,ls2uper/jekyll,greent2008/jekyll,omeripek/jekyll,oresmus/jekyll,UniFreak/jekyllcn,jeffkole/jekyll,18F/jekyll,18F/jekyll,bsmr-ruby/jekyll,CorainChicago/jekyll,greent2008/jekyll,imaustink/jekyll,digideskio/jekyll,drobati/jekyll,harrissoerja/jekyll,jekyll/jekyll,MauroMrod/jekyll,digideskio/jekyll,MauroMrod/jekyll,johnnycastilho/jekyll,rasa2011/rasa2011.github.io,princeofdarkness76/jekyll,nemotan/jekyll,backendeveloper/jekyll,eninya/jekyll,fulldecent/jekyll,adilapapaya/jekyll,howkj1/jekyll,tugberkugurlu/jekyll,garvitr/jekyll,UniFreak/jekyllcn,alex-kovac/jekyll,princeofdarkness76/jekyll,eloyesp/jekyll,jmptrader/jekyll,mixxmac/jekyll,nasht00/jekyll,Strangehill/jekyll,angeliaz/jekyll,nasht00/jekyll,LuoPX-15510486969/jekyll,darwin/jekyll,wadaries/jekyll,Teino1978-Corp/Teino1978-Corp-jekyll,ducktyper/jekyll,vidbina/jekyll,gencer/jekyll,18F/jekyll,indraj/jekyll,trungvothanh/jekyll,superve/jekyll,tomasdiez/jekyll,Teino1978-Corp/Teino1978-Corp-jekyll,Tyrion22/jekyll,xiaoshaozi52/jekyll,nasht00/jekyll,nickg33/jekyll,tillgrallert/jekyll,stevecrozz/jekyll,alihalabyah/jekyll,jmhardison/jekyll,harrissoerja/jekyll,mrb/jekyll,darwin/jekyll,ramoslin02/jekyll,princeofdarkness76/jekyll,cyberid41/jekyll,ewinkler/jekyll,ReachingOut/jekyll,xcatliu/jekyllcn,alex-kovac/jekyll,fengsmith/jekyll,abhilashhb/jekyll,noikiy/jekyll,hiteshsuthar/jekyll,likong/jekyll,rebornix/jekyll,hartmel/jekyll,tomasdiez/jekyll,alfredxing/jekyll,christophermanning/jekyll,imaustink/jekyll,iRoxx/jekyll,tamouse/jekyll,htmelvis/jekyll,martynbm/jekyll,leichunxin/jekyll,ZDroid/jekyll,cyberid41/jekyll,CorainChicago/jekyll,brint/jekyll,rasa2011/rasa2011.github.io,backendeveloper/jekyll,codeclimate-testing/jekyll,dangaute/eng,rasa2011/rasa2011.github.io,htmelvis/jekyll,stomar/jekyll,tamouse/jekyll,nateberkopec/jekyll,nickg33/jekyll,ReachingOut/jekyll,tylermachen/jekyll,ZainRizvi/jekyll,supriyantomaftuh/jekyll,mixxmac/jekyll,alihalabyah/jekyll,darwin/jekyll,tomjohnson1492/jekyll,mnuessler/jekyll,jeffkole/jekyll,Kinghack/kinghack.github.com,hubsaysnuaa/jekyll,codeclimate-testing/jekyll,MauroMrod/jekyll,angeliaz/jekyll,egobrightan/jekyll,Tiger66639/jekyll,tobscure/jekyll,omeripek/jekyll,winndows/jekyll,x-way/jekyll,tillgrallert/jekyll,gkunwar/gkunwar.github.io,jmepg/jekyll,tobscure/jekyll,stomar/jekyll,EddieDow/jekyll,tareq-s/jekyll,Wirachmat/jekyll,gencer/jekyll,likong/jekyll,AnanthaRajuC/jekyll,tamouse/jekyll,pheuko/jekyll,chiyodad/jekyll,pheuko/jekyll,shuber2/jekyll,foocoder/jekyll,harrissoerja/jekyll,ZainRizvi/jekyll,zhangkuaiji/jekyllcn,rovrevik/jekyll,alihalabyah/jekyll,rlugojr/jekyll,nateberkopec/jekyll,naughtyboy83/jekyll,rongl/jekyll,Wirachmat/jekyll,garvitr/jekyll,thetaxman/jekyll,xiaoshaozi52/jekyll,CheekyFE/jekyll,Tyrion22/jekyll,kimeng/jekyll,winndows/jekyll,sanxore/sanxore.github.com,krahman/jekyll,chiyodad/jekyll,brint/jekyll,derekgottlieb/jekyll,martynbm/jekyll,teju111/jekyll,mrb/jekyll,shliujing/jekyll,ls2uper/jekyll,ryanshaw/jekyll,leichunxin/jekyll,jaybe-jekyll/jekyll,xantage/jekyll,kuangyeheng/jekyll,Teino1978-Corp/jekyll,rlugojr/jekyll,wentixiaogege/jekyll,floydpraveen/jekyll,sasongkojati/jekyll,Kinghack/kinghack.github.com,jaroot32/jekyll,m2candre/jekyll,gaosboy/jekyll,xiebinhqy/jklly_china,goragod/jekyll,rovrevik/jekyll,gkunwar/gkunwar.github.io,noikiy/jekyll,zsyed91/jekyll,UniFreak/jekyllcn,naughtyboy83/jekyll,shliujing/jekyll,LeuisKen/jekyllcn,CheekyFE/jekyll,stevecrozz/jekyll,floydpraveen/jekyll,pmarsceill/jekyll,leichunxin/jekyll,gaosboy/jekyll,ramoslin02/jekyll,Tiger66639/jekyll,teju111/jekyll,zhangkuaiji/jekyllcn,doubleday/jekyll,ZDroid/jekyll,QuinntyneBrown/jekyll,nasht00/jekyll,fulldecent/jekyll,yihangho/jekyll,ReachingOut/jekyll,m2candre/jekyll,alfredxing/jekyll,oresmus/jekyll,iRoxx/jekyll,fengsmith/jekyllcn,yihangho/jekyll,tobscure/jekyll,nemotan/jekyll,xiongjungit/jekyll,daniel-beck/jekyll,xcatliu/jekyllcn,CPVPLachlan/CPVP-Blog,tylermachen/jekyll,Teino1978-Corp/jekyll,vcgato29/jekyll,Teino1978-Corp/Teino1978-Corp-jekyll,drobati/jekyll,xcatliu/jekyllcn,yihangho/jekyll,Kinghack/kinghack.github.com,nathanhorrigan1/webdeveloper,ewinkler/jekyll,eloyesp/jekyll,nathanhorrigan1/webdeveloper,larryfox/jekyll,jaroot32/jekyll,Teino1978-Corp/jekyll,dezon/jekyll,anthonyrosengren/grasshoppergathering2.github-io,kuangyeheng/jekyll,tomjohnson1492/jekyll,ewinkler/jekyll,rlugojr/jekyll,jaybe-jekyll/jekyll,noikiy/jekyll,fabulousu/jekyll,jmknoll/jekyll,abhilashhb/jekyll,anthonyrosengren/grasshoppergathering2.github-io,brint/jekyll,saitodisse/jekyll,bsmr-ruby/jekyll,nickg33/jekyll,jmknoll/jekyll,0x00evil/jekyll,hartmel/jekyll,fulldecent/jekyll,johnnycastilho/jekyll,getandpost/jekyll.github.io,ryanshaw/jekyll,alex-kovac/jekyll,jmhardison/jekyll,gaosboy/jekyll,zsyed91/jekyll,hartmel/jekyll,floydpraveen/jekyll,getandpost/jekyll.github.io,Wirachmat/jekyll,vcgato29/jekyll,honger05/jekyllcn,xiebinhqy/jklly_china,imaustink/jekyll,jmptrader/jekyll,matuzo/jekyll,teju111/jekyll,rajrathore/jekyll,krishnakalyan3/jekyll,doubleday/jekyll,nathanhorrigan1/webdeveloper,PepSalehi/jekyll,CheekyFE/jekyll,ajhit406/jekyll,krishnakalyan3/jekyll,kimeng/jekyll,krahman/jekyll,jeffkole/jekyll,wentixiaogege/jekyll,tareq-s/jekyll,winndows/jekyll,MjAbuz/jekyll,stevecrozz/jekyll,krahman/jekyll,desidude03/jekyll,royalwang/jekyll,mnuessler/jekyll,rajrathore/jekyll,chinayin/jekyll,yhironaka/yhironaka.github.io,ajhit406/jekyll,jmknoll/jekyll,penchan1218/jekyllcn,penchan1218/jekyllcn,fulldecent/jekyll,eloyesp/jekyll,aarvay/jekyll,pheuko/jekyll,xiebinhqy/jklly_china,QuinntyneBrown/jekyll,QuinntyneBrown/jekyll,sasongkojati/jekyll,iRoxx/jekyll,daniel-beck/jekyll,tomasdiez/jekyll,gkunwar/gkunwar.github.io,ZainRizvi/jekyll,xtymichael/jekyll,vidbina/jekyll,ducktyper/jekyll,goragod/jekyll,SQS2/Test,hubsaysnuaa/jekyll,liukaijv/jekyll,Strangehill/jekyll,derekgottlieb/jekyll,PepSalehi/jekyll,gencer/jekyll,mixxmac/jekyll,Strangehill/jekyll,garvitr/jekyll,jekyll/jekyll,dezon/jekyll,richsoni/jekyll,tillgrallert/jekyll,gencer/jekyll,kimeng/jekyll,fabulousu/jekyll,ls2uper/jekyll,supriyantomaftuh/jekyll,gencer/jekyll,chinayin/jekyll,rajrathore/jekyll,mrb/jekyll,desidude03/jekyll,Strangehill/jekyll,mrb/jekyll,chrisfinazzo/jekyll,tomjohnson1492/jekyll,gynter/jekyll,zsyed91/jekyll,ryanshaw/jekyll,larryfox/jekyll,martynbm/jekyll,fabulousu/jekyll,AtekiRyu/jekyll,indraj/jekyll,tugberkugurlu/jekyll,tugberkugurlu/jekyll,nemotan/jekyll,backendeveloper/jekyll,AaronSikes/jekyll,jaybe-jekyll/jekyll,rongl/jekyll,foocoder/jekyll,howkj1/jekyll,pmarsceill/jekyll,FlyingWHR/jekyll,CPVPLachlan/CPVP-Blog,greent2008/jekyll,CPVPLachlan/CPVP-Blog,dansef/jekyll,xiongjungit/jekyll,jekyll/jekyll,mnuessler/jekyll,getandpost/jekyll.github.io,xantage/jekyll,johnnycastilho/jekyll,rovrevik/jekyll,larryfox/jekyll,sanxore/sanxore.github.com,fengsmith/jekyllcn,christophermanning/jekyll,julienbourdeau/jekyll,princeofdarkness76/jekyll,jaybe-jekyll/jekyll,saitodisse/jekyll,likong/jekyll,superve/jekyll,xiongjungit/jekyll,FlyingWHR/jekyll,LuoPX-15510486969/jekyll,chinayin/jekyll,oresmus/jekyll,alex-kovac/jekyll,marrujoalex/jekyll,ZDroid/jekyll,jmptrader/jekyll,superve/jekyll,richsoni/jekyll,tillgrallert/jekyll,nateberkopec/jekyll,PepSalehi/jekyll,trungvothanh/jekyll,vcgato29/jekyll,marrujoalex/jekyll,derekgottlieb/jekyll,LeuisKen/jekyllcn,gynter/jekyll,EddieDow/jekyll,shliujing/jekyll,jekyll/jekyll,angeliaz/jekyll,saitodisse/jekyll,aarvay/jekyll