Serialize value attribute on Preference
Serialize value attribute on Preference

Rails 4 doesn't type-cast unknown types to YAML so the build were
getting errors like "can't cast type array to string"
see https://github.com/rails/rails/pull/4558

Mayvenn/spree,ckk-scratch/solidus,maybii/spree,kitwalker12/spree,hoanghiep90/spree,bonobos/solidus,vinayvinsol/spree,JuandGirald/spree,berkes/spree,odk211/spree,sliaquat/spree,patdec/spree,zaeznet/spree,DarkoP/spree,ahmetabdi/spree,jhawthorn/spree,Arpsara/solidus,jimblesm/spree,degica/spree,karlitxo/spree,pulkit21/spree,SadTreeFriends/spree,progsri/spree,jparr/spree,ujai/spree,yiqing95/spree,jasonfb/spree,orenf/spree,PhoenixTeam/spree_phoenix,Kagetsuki/spree,camelmasa/spree,alepore/spree,calvinl/spree,grzlus/spree,zamiang/spree,rakibulislam/spree,piousbox/spree,azranel/spree,zaeznet/spree,carlesjove/spree,wolfieorama/spree,caiqinghua/spree,raow/spree,reidblomquist/spree,lsirivong/spree,patdec/spree,Senjai/solidus,imella/spree,yomishra/pce,dandanwei/spree,delphsoft/spree-store-ballchair,softr8/spree,ramkumar-kr/spree,PhoenixTeam/spree_phoenix,lsirivong/solidus,radarseesradar/spree,archSeer/spree,lsirivong/spree,yiqing95/spree,sideci-sample/sideci-sample-spree,adaddeo/spree,adaddeo/spree,grzlus/solidus,scottcrawford03/solidus,raow/spree,yushine/spree,beni55/spree,grzlus/solidus,mindvolt/spree,locomotivapro/spree,urimikhli/spree,alejandromangione/spree,FadliKun/spree,joanblake/spree,project-eutopia/spree,vcavallo/spree,miyazawatomoka/spree,watg/spree,alejandromangione/spree,archSeer/spree,trigrass2/spree,azclick/spree,Hates/spree,tailic/spree,LBRapid/spree,TrialGuides/spree,odk211/spree,siddharth28/spree,piousbox/spree,AgilTec/spree,jaspreet21anand/spree,thogg4/spree,tailic/spree,jhawthorn/spree,beni55/spree,forkata/solidus,tomash/spree,hifly/spree,tesserakt/clean_spree,softr8/spree,archSeer/spree,fahidnasir/spree,yushine/spree,dotandbo/spree,odk211/spree,zamiang/spree,Senjai/spree,pulkit21/spree,edgward/spree,builtbybuffalo/spree,jsurdilla/solidus,Senjai/solidus,ramkumar-kr/spree,KMikhaylovCTG/spree,kitwalker12/spree,patdec/spree,dotandbo/spree,siddharth28/spree,moneyspyder/spree,jordan-brough/solidus,CJMrozek/spree,alepore/spree,keatonrow/spree,Mayvenn/spree,calvinl/spree,shekibobo/spree,Hawaiideveloper/shoppingcart,woboinc/spree,APohio/spree,groundctrl/spree,LBRapid/spree,Nevensoft/spree,DynamoMTL/spree,hifly/spree,omarsar/spree,DarkoP/spree,agient/agientstorefront,jeffboulet/spree,orenf/spree,scottcrawford03/solidus,dafontaine/spree,mindvolt/spree,athal7/solidus,derekluo/spree,reidblomquist/spree,assembledbrands/spree,Kagetsuki/spree,shaywood2/spree,grzlus/spree,locomotivapro/spree,welitonfreitas/spree,FadliKun/spree,jspizziri/spree,azclick/spree,ayb/spree,CJMrozek/spree,KMikhaylovCTG/spree,Lostmyname/spree,pjmj777/spree,CJMrozek/spree,dotandbo/spree,Hates/spree,AgilTec/spree,imella/spree,APohio/spree,Nevensoft/spree,Migweld/spree,vmatekole/spree,JDutil/spree,radarseesradar/spree,alvinjean/spree,Arpsara/solidus,tancnle/spree,brchristian/spree,brchristian/spree,azclick/spree,volpejoaquin/spree,delphsoft/spree-store-ballchair,pervino/solidus,devilcoders/solidus,nooysters/spree,rajeevriitm/spree,vinsol/spree,pervino/spree,berkes/spree,dotandbo/spree,jordan-brough/solidus,net2b/spree,omarsar/spree,delphsoft/spree-store-ballchair,tomash/spree,dafontaine/spree,Arpsara/solidus,calvinl/spree,progsri/spree,volpejoaquin/spree,Nevensoft/spree,pervino/spree,NerdsvilleCEO/spree,orenf/spree,berkes/spree,ujai/spree,PhoenixTeam/spree_phoenix,ckk-scratch/solidus,raow/spree,SadTreeFriends/spree,vmatekole/spree,Mayvenn/spree,edgward/spree,caiqinghua/spree,SadTreeFriends/spree,fahidnasir/spree,zamiang/spree,moneyspyder/spree,progsri/spree,firman/spree,bonobos/solidus,caiqinghua/spree,pervino/spree,gautamsawhney/spree,project-eutopia/spree,jparr/spree,carlesjove/spree,hoanghiep90/spree,forkata/solidus,degica/spree,dandanwei/spree,archSeer/spree,project-eutopia/spree,zaeznet/spree,reinaris/spree,assembledbrands/spree,cutefrank/spree,kewaunited/spree,biagidp/spree,trigrass2/spree,vulk/spree,yiqing95/spree,jasonfb/spree,trigrass2/spree,Boomkat/spree,ramkumar-kr/spree,jeffboulet/spree,Engeltj/spree,camelmasa/spree,mleglise/spree,SadTreeFriends/spree,kewaunited/spree,mindvolt/spree,tomash/spree,lsirivong/spree,jparr/spree,tesserakt/clean_spree,joanblake/spree,JuandGirald/spree,karlitxo/spree,beni55/spree,groundctrl/spree,knuepwebdev/FloatTubeRodHolders,forkata/solidus,keatonrow/spree,rbngzlv/spree,jaspreet21anand/spree,alejandromangione/spree,adaddeo/spree,Senjai/spree,sfcgeorge/spree,surfdome/spree,edgward/spree,vinsol/spree,hoanghiep90/spree,jeffboulet/spree,vmatekole/spree,devilcoders/solidus,wolfieorama/spree,joanblake/spree,robodisco/spree,tesserakt/clean_spree,derekluo/spree,grzlus/spree,woboinc/spree,reinaris/spree,jsurdilla/solidus,vinayvinsol/spree,priyank-gupta/spree,watg/spree,lsirivong/solidus,jsurdilla/solidus,ahmetabdi/spree,Migweld/spree,Arpsara/solidus,JuandGirald/spree,derekluo/spree,ayb/spree,moneyspyder/spree,gautamsawhney/spree,shekibobo/spree,carlesjove/spree,trigrass2/spree,yushine/spree,surfdome/spree,TrialGuides/spree,gautamsawhney/spree,useiichi/spree,brchristian/spree,pervino/spree,DynamoMTL/spree,pjmj777/spree,APohio/spree,Lostmyname/spree,sliaquat/spree,DynamoMTL/spree,rbngzlv/spree,progsri/spree,Hawaiideveloper/shoppingcart,KMikhaylovCTG/spree,richardnuno/solidus,jimblesm/spree,tomash/spree,Ropeney/spree,priyank-gupta/spree,FadliKun/spree,radarseesradar/spree,vinayvinsol/spree,NerdsvilleCEO/spree,robodisco/spree,surfdome/spree,Kagetsuki/spree,piousbox/spree,maybii/spree,sfcgeorge/spree,jhawthorn/spree,cutefrank/spree,pervino/solidus,njerrywerry/spree,volpejoaquin/spree,sideci-sample/sideci-sample-spree,jasonfb/spree,woboinc/spree,abhishekjain16/spree,grzlus/solidus,Senjai/solidus,carlesjove/spree,athal7/solidus,vulk/spree,athal7/solidus,vinsol/spree,knuepwebdev/FloatTubeRodHolders,thogg4/spree,sliaquat/spree,useiichi/spree,alvinjean/spree,maybii/spree,vinsol/spree,jasonfb/spree,keatonrow/spree,dandanwei/spree,zamiang/spree,JuandGirald/spree,richardnuno/solidus,TrialGuides/spree,gregoryrikson/spree-sample,xuewenfei/solidus,fahidnasir/spree,sliaquat/spree,freerunningtech/spree,bricesanchez/spree,jordan-brough/solidus,CJMrozek/spree,urimikhli/spree,KMikhaylovCTG/spree,Ropeney/spree,mleglise/spree,nooysters/spree,AgilTec/spree,dafontaine/spree,nooysters/spree,madetech/spree,robodisco/spree,maybii/spree,lyzxsc/spree,reidblomquist/spree,grzlus/solidus,Nevensoft/spree,rajeevriitm/spree,gregoryrikson/spree-sample,net2b/spree,freerunningtech/spree,wolfieorama/spree,jordan-brough/spree,quentinuys/spree,alvinjean/spree,degica/spree,nooysters/spree,bricesanchez/spree,beni55/spree,yomishra/pce,alepore/spree,athal7/solidus,welitonfreitas/spree,lyzxsc/spree,mleglise/spree,shaywood2/spree,pjmj777/spree,tancnle/spree,locomotivapro/spree,NerdsvilleCEO/spree,ujai/spree,omarsar/spree,Machpowersystems/spree_mach,CiscoCloud/spree,DarkoP/spree,Senjai/spree,sfcgeorge/spree,NerdsvilleCEO/spree,ayb/spree,CiscoCloud/spree,ckk-scratch/solidus,volpejoaquin/spree,useiichi/spree,TimurTarasenko/spree,jimblesm/spree,camelmasa/spree,StemboltHQ/spree,StemboltHQ/spree,reinaris/spree,lsirivong/spree,yushine/spree,siddharth28/spree,builtbybuffalo/spree,quentinuys/spree,jsurdilla/solidus,alejandromangione/spree,firman/spree,edgward/spree,reidblomquist/spree,pulkit21/spree,welitonfreitas/spree,shaywood2/spree,bjornlinder/Spree,grzlus/spree,cutefrank/spree,madetech/spree,CiscoCloud/spree,xuewenfei/solidus,welitonfreitas/spree,Hates/spree,piousbox/spree,pulkit21/spree,miyazawatomoka/spree,rbngzlv/spree,thogg4/spree,miyazawatomoka/spree,devilcoders/solidus,ahmetabdi/spree,vcavallo/spree,Machpowersystems/spree_mach,LBRapid/spree,sunny2601/spree,bricesanchez/spree,zaeznet/spree,freerunningtech/spree,Hawaiideveloper/shoppingcart,agient/agientstorefront,devilcoders/solidus,shioyama/spree,azclick/spree,Engeltj/spree,Boomkat/spree,keatonrow/spree,siddharth28/spree,agient/agientstorefront,jspizziri/spree,caiqinghua/spree,miyazawatomoka/spree,mindvolt/spree,madetech/spree,madetech/spree,rajeevriitm/spree,quentinuys/spree,shioyama/spree,abhishekjain16/spree,shekibobo/spree,FadliKun/spree,bjornlinder/Spree,vulk/spree,shioyama/spree,jaspreet21anand/spree,vinayvinsol/spree,njerrywerry/spree,wolfieorama/spree,dafontaine/spree,robodisco/spree,hifly/spree,biagidp/spree,jeffboulet/spree,agient/agientstorefront,lsirivong/solidus,bonobos/solidus,PhoenixTeam/spree_phoenix,scottcrawford03/solidus,gregoryrikson/spree-sample,derekluo/spree,njerrywerry/spree,groundctrl/spree,delphsoft/spree-store-ballchair,pervino/solidus,JDutil/spree,jparr/spree,jordan-brough/spree,Migweld/spree,patdec/spree,yomishra/pce,rakibulislam/spree,CiscoCloud/spree,DynamoMTL/spree,jordan-brough/solidus,mleglise/spree,sideci-sample/sideci-sample-spree,jspizziri/spree,kitwalker12/spree,dandanwei/spree,tesserakt/clean_spree,shekibobo/spree,gregoryrikson/spree-sample,jspizziri/spree,radarseesradar/spree,hoanghiep90/spree,kewaunited/spree,Senjai/solidus,richardnuno/solidus,sfcgeorge/spree,vulk/spree,abhishekjain16/spree,reinaris/spree,scottcrawford03/solidus,Migweld/spree,lyzxsc/spree,DarkoP/spree,watg/spree,groundctrl/spree,hifly/spree,project-eutopia/spree,thogg4/spree,RatioClothing/spree,vcavallo/spree,bonobos/solidus,azranel/spree,AgilTec/spree,firman/spree,TrialGuides/spree,orenf/spree,njerrywerry/spree,APohio/spree,Engeltj/spree,omarsar/spree,ckk-scratch/solidus,quentinuys/spree,Engeltj/spree,net2b/spree,builtbybuffalo/spree,Mayvenn/spree,brchristian/spree,fahidnasir/spree,adaddeo/spree,azranel/spree,jaspreet21anand/spree,RatioClothing/spree,JDutil/spree,joanblake/spree,raow/spree,StemboltHQ/spree,sunny2601/spree,gautamsawhney/spree,sunny2601/spree,jimblesm/spree,rbngzlv/spree,camelmasa/spree,priyank-gupta/spree,lyzxsc/spree,yiqing95/spree,kewaunited/spree,softr8/spree,knuepwebdev/FloatTubeRodHolders,builtbybuffalo/spree,odk211/spree,xuewenfei/solidus,forkata/solidus,RatioClothing/spree,JDutil/spree,abhishekjain16/spree,Kagetsuki/spree,xuewenfei/solidus,rakibulislam/spree,Hawaiideveloper/shoppingcart,vmatekole/spree,rajeevriitm/spree,urimikhli/spree,tailic/spree,ahmetabdi/spree,surfdome/spree,TimurTarasenko/spree,ramkumar-kr/spree,Machpowersystems/spree_mach,cutefrank/spree,Ropeney/spree,shaywood2/spree,Boomkat/spree,moneyspyder/spree,priyank-gupta/spree,lsirivong/solidus,Ropeney/spree,net2b/spree,karlitxo/spree,TimurTarasenko/spree,Lostmyname/spree,rakibulislam/spree,sunny2601/spree,karlitxo/spree,azranel/spree,assembledbrands/spree,calvinl/spree,Hates/spree,tancnle/spree,firman/spree,useiichi/spree,jordan-brough/spree,alvinjean/spree,locomotivapro/spree,biagidp/spree,imella/spree,richardnuno/solidus,tancnle/spree,ayb/spree,vcavallo/spree,softr8/spree,Boomkat/spree,pervino/solidus,bjornlinder/Spree,TimurTarasenko/spree,berkes/spree,Lostmyname/spree