Updated Readme.
Updated Readme.

* Updated introductory text to fix a grammatical mistake and changed 'commerce' to 'e-commerce'
* Added syntax highlighting to Gemfile line.
* Made 'Contributing' section read slightly nicer.
* Made tabs consistent throughout the document

[Fixes #1417]

TrialGuides/spree,pulkit21/spree,mleglise/spree,sfcgeorge/spree,patdec/spree,grzlus/solidus,reidblomquist/spree,piousbox/spree,Mayvenn/spree,njerrywerry/spree,berkes/spree,Ropeney/spree,alepore/spree,jimblesm/spree,sideci-sample/sideci-sample-spree,assembledbrands/spree,reinaris/spree,builtbybuffalo/spree,biagidp/spree,surfdome/spree,devilcoders/solidus,FadliKun/spree,SadTreeFriends/spree,StemboltHQ/spree,azclick/spree,siddharth28/spree,alvinjean/spree,omarsar/spree,Senjai/solidus,ayb/spree,jhawthorn/spree,lyzxsc/spree,vinayvinsol/spree,odk211/spree,rbngzlv/spree,DarkoP/spree,groundctrl/spree,cutefrank/spree,jimblesm/spree,APohio/spree,DynamoMTL/spree,thogg4/spree,calvinl/spree,fahidnasir/spree,dandanwei/spree,jordan-brough/solidus,groundctrl/spree,pervino/spree,gregoryrikson/spree-sample,quentinuys/spree,freerunningtech/spree,alvinjean/spree,Boomkat/spree,ujai/spree,CJMrozek/spree,sfcgeorge/spree,gregoryrikson/spree-sample,urimikhli/spree,richardnuno/solidus,agient/agientstorefront,Kagetsuki/spree,JDutil/spree,siddharth28/spree,xuewenfei/solidus,Ropeney/spree,bricesanchez/spree,reinaris/spree,woboinc/spree,vinsol/spree,reidblomquist/spree,FadliKun/spree,forkata/solidus,bricesanchez/spree,priyank-gupta/spree,DarkoP/spree,brchristian/spree,nooysters/spree,delphsoft/spree-store-ballchair,robodisco/spree,lyzxsc/spree,TimurTarasenko/spree,wolfieorama/spree,tesserakt/clean_spree,yomishra/pce,NerdsvilleCEO/spree,radarseesradar/spree,AgilTec/spree,jparr/spree,DynamoMTL/spree,piousbox/spree,mindvolt/spree,groundctrl/spree,zamiang/spree,shekibobo/spree,zamiang/spree,jeffboulet/spree,CJMrozek/spree,SadTreeFriends/spree,jaspreet21anand/spree,lzcabrera/spree-1-3-stable,wolfieorama/spree,alepore/spree,alvinjean/spree,scottcrawford03/solidus,Arpsara/solidus,TrialGuides/spree,sliaquat/spree,jasonfb/spree,Hawaiideveloper/shoppingcart,vinayvinsol/spree,thogg4/spree,bonobos/solidus,codesavvy/sandbox,maybii/spree,gregoryrikson/spree-sample,archSeer/spree,kitwalker12/spree,lsirivong/spree,madetech/spree,lyzxsc/spree,yushine/spree,zaeznet/spree,agient/agientstorefront,Senjai/solidus,sfcgeorge/spree,APohio/spree,hoanghiep90/spree,jeffboulet/spree,judaro13/spree-fork,orenf/spree,sfcgeorge/spree,forkata/solidus,lzcabrera/spree-1-3-stable,Engeltj/spree,Kagetsuki/spree,azranel/spree,project-eutopia/spree,SadTreeFriends/spree,richardnuno/solidus,pervino/spree,jsurdilla/solidus,jeffboulet/spree,caiqinghua/spree,volpejoaquin/spree,RatioClothing/spree,azclick/spree,reidblomquist/spree,codesavvy/sandbox,dafontaine/spree,pervino/spree,vcavallo/spree,pulkit21/spree,rajeevriitm/spree,TimurTarasenko/spree,sliaquat/spree,progsri/spree,zamiang/spree,builtbybuffalo/spree,tomash/spree,patdec/spree,Hawaiideveloper/shoppingcart,derekluo/spree,calvinl/spree,mleglise/spree,karlitxo/spree,jhawthorn/spree,JuandGirald/spree,nooysters/spree,derekluo/spree,jaspreet21anand/spree,raow/spree,sideci-sample/sideci-sample-spree,caiqinghua/spree,ckk-scratch/solidus,watg/spree,Engeltj/spree,JuandGirald/spree,rakibulislam/spree,keatonrow/spree,APohio/spree,dafontaine/spree,DynamoMTL/spree,beni55/spree,athal7/solidus,JDutil/spree,project-eutopia/spree,pjmj777/spree,yomishra/pce,JDutil/spree,dandanwei/spree,shekibobo/spree,karlitxo/spree,jordan-brough/solidus,edgward/spree,trigrass2/spree,alvinjean/spree,athal7/solidus,maybii/spree,PhoenixTeam/spree_phoenix,net2b/spree,archSeer/spree,pervino/solidus,piousbox/spree,orenf/spree,piousbox/spree,woboinc/spree,adaddeo/spree,codesavvy/sandbox,njerrywerry/spree,LBRapid/spree,carlesjove/spree,yomishra/pce,jimblesm/spree,Lostmyname/spree,Migweld/spree,zaeznet/spree,ckk-scratch/solidus,calvinl/spree,orenf/spree,jordan-brough/spree,beni55/spree,dotandbo/spree,yushine/spree,abhishekjain16/spree,grzlus/spree,Migweld/spree,vmatekole/spree,RatioClothing/spree,Senjai/solidus,alepore/spree,softr8/spree,rajeevriitm/spree,lsirivong/spree,Machpowersystems/spree_mach,HealthWave/spree,robodisco/spree,welitonfreitas/spree,hoanghiep90/spree,locomotivapro/spree,keatonrow/spree,moneyspyder/spree,fahidnasir/spree,jasonfb/spree,bjornlinder/Spree,firman/spree,archSeer/spree,kitwalker12/spree,camelmasa/spree,grzlus/solidus,Hates/spree,pervino/solidus,freerunningtech/spree,ramkumar-kr/spree,jaspreet21anand/spree,assembledbrands/spree,mindvolt/spree,trigrass2/spree,madetech/spree,sunny2601/spree,shioyama/spree,miyazawatomoka/spree,rbngzlv/spree,hifly/spree,codesavvy/sandbox,devilcoders/solidus,grzlus/spree,shekibobo/spree,omarsar/spree,urimikhli/spree,radarseesradar/spree,DarkoP/spree,vinsol/spree,derekluo/spree,vulk/spree,JuandGirald/spree,robodisco/spree,PhoenixTeam/spree_phoenix,Ropeney/spree,reinaris/spree,dafontaine/spree,useiichi/spree,NerdsvilleCEO/spree,devilcoders/solidus,Senjai/spree,firman/spree,ayb/spree,AgilTec/spree,biagidp/spree,AgilTec/spree,sunny2601/spree,adaddeo/spree,AgilTec/spree,HealthWave/spree,mleglise/spree,ramkumar-kr/spree,Nevensoft/spree,delphsoft/spree-store-ballchair,Ropeney/spree,rajeevriitm/spree,delphsoft/spree-store-ballchair,agient/agientstorefront,lsirivong/solidus,grzlus/spree,bricesanchez/spree,wolfieorama/spree,Senjai/spree,tomash/spree,shaywood2/spree,radarseesradar/spree,Migweld/spree,kitwalker12/spree,ayb/spree,HealthWave/spree,priyank-gupta/spree,hifly/spree,JDutil/spree,vulk/spree,pervino/spree,FadliKun/spree,berkes/spree,Antdesk/karpal-spree,pjmj777/spree,bonobos/solidus,scottcrawford03/solidus,net2b/spree,jspizziri/spree,jimblesm/spree,TimurTarasenko/spree,welitonfreitas/spree,ahmetabdi/spree,vcavallo/spree,yushine/spree,tesserakt/clean_spree,nooysters/spree,quentinuys/spree,grzlus/spree,maybii/spree,project-eutopia/spree,surfdome/spree,vinayvinsol/spree,madetech/spree,shaywood2/spree,Hawaiideveloper/shoppingcart,brchristian/spree,imella/spree,ahmetabdi/spree,Lostmyname/spree,vulk/spree,Lostmyname/spree,Arpsara/solidus,Boomkat/spree,NerdsvilleCEO/spree,beni55/spree,imella/spree,Antdesk/karpal-spree,degica/spree,softr8/spree,imella/spree,bjornlinder/Spree,progsri/spree,karlitxo/spree,Boomkat/spree,jsurdilla/solidus,richardnuno/solidus,Nevensoft/spree,kewaunited/spree,judaro13/spree-fork,njerrywerry/spree,raow/spree,JuandGirald/spree,forkata/solidus,tancnle/spree,jordan-brough/solidus,jhawthorn/spree,kewaunited/spree,madetech/spree,yiqing95/spree,volpejoaquin/spree,Hates/spree,alejandromangione/spree,TimurTarasenko/spree,keatonrow/spree,DarkoP/spree,degica/spree,abhishekjain16/spree,tancnle/spree,grzlus/solidus,tailic/spree,edgward/spree,Mayvenn/spree,dandanwei/spree,lsirivong/solidus,derekluo/spree,sliaquat/spree,StemboltHQ/spree,SadTreeFriends/spree,tesserakt/clean_spree,kewaunited/spree,edgward/spree,ujai/spree,forkata/solidus,robodisco/spree,Machpowersystems/spree_mach,odk211/spree,Arpsara/solidus,abhishekjain16/spree,athal7/solidus,bjornlinder/Spree,builtbybuffalo/spree,scottcrawford03/solidus,fahidnasir/spree,rakibulislam/spree,Senjai/solidus,keatonrow/spree,useiichi/spree,vmatekole/spree,PhoenixTeam/spree_phoenix,DynamoMTL/spree,Kagetsuki/spree,camelmasa/spree,vmatekole/spree,tesserakt/clean_spree,joanblake/spree,Hawaiideveloper/shoppingcart,hifly/spree,Nevensoft/spree,CiscoCloud/spree,thogg4/spree,dandanwei/spree,moneyspyder/spree,Mayvenn/spree,tomash/spree,Arpsara/solidus,TrialGuides/spree,jaspreet21anand/spree,reidblomquist/spree,jsurdilla/solidus,athal7/solidus,sliaquat/spree,camelmasa/spree,ramkumar-kr/spree,ayb/spree,Kagetsuki/spree,brchristian/spree,lyzxsc/spree,brchristian/spree,freerunningtech/spree,locomotivapro/spree,siddharth28/spree,yiqing95/spree,miyazawatomoka/spree,ckk-scratch/solidus,dotandbo/spree,net2b/spree,biagidp/spree,Senjai/spree,joanblake/spree,Hates/spree,moneyspyder/spree,Nevensoft/spree,cutefrank/spree,zaeznet/spree,mindvolt/spree,RatioClothing/spree,lzcabrera/spree-1-3-stable,rajeevriitm/spree,judaro13/spree-fork,useiichi/spree,rakibulislam/spree,odk211/spree,locomotivapro/spree,surfdome/spree,shekibobo/spree,priyank-gupta/spree,raow/spree,abhishekjain16/spree,alejandromangione/spree,softr8/spree,miyazawatomoka/spree,azranel/spree,radarseesradar/spree,ujai/spree,mindvolt/spree,knuepwebdev/FloatTubeRodHolders,wolfieorama/spree,quentinuys/spree,alejandromangione/spree,jordan-brough/solidus,jeffboulet/spree,StemboltHQ/spree,orenf/spree,jparr/spree,jparr/spree,degica/spree,reinaris/spree,net2b/spree,Antdesk/karpal-spree,lsirivong/spree,lsirivong/solidus,vcavallo/spree,KMikhaylovCTG/spree,carlesjove/spree,adaddeo/spree,yushine/spree,richardnuno/solidus,trigrass2/spree,gautamsawhney/spree,CiscoCloud/spree,watg/spree,woboinc/spree,LBRapid/spree,xuewenfei/solidus,caiqinghua/spree,zaeznet/spree,locomotivapro/spree,jspizziri/spree,tailic/spree,Engeltj/spree,assembledbrands/spree,progsri/spree,project-eutopia/spree,KMikhaylovCTG/spree,vulk/spree,urimikhli/spree,thogg4/spree,tancnle/spree,shioyama/spree,odk211/spree,azranel/spree,gautamsawhney/spree,azclick/spree,KMikhaylovCTG/spree,rbngzlv/spree,Hates/spree,softr8/spree,pulkit21/spree,TrialGuides/spree,gautamsawhney/spree,firman/spree,jparr/spree,njerrywerry/spree,beni55/spree,Lostmyname/spree,CJMrozek/spree,siddharth28/spree,ahmetabdi/spree,azranel/spree,Engeltj/spree,archSeer/spree,delphsoft/spree-store-ballchair,jordan-brough/spree,quentinuys/spree,tancnle/spree,surfdome/spree,groundctrl/spree,yiqing95/spree,priyank-gupta/spree,vmatekole/spree,pervino/solidus,alejandromangione/spree,CJMrozek/spree,jasonfb/spree,CiscoCloud/spree,welitonfreitas/spree,Migweld/spree,pjmj777/spree,devilcoders/solidus,gregoryrikson/spree-sample,nooysters/spree,maybii/spree,omarsar/spree,kewaunited/spree,rbngzlv/spree,vinsol/spree,shaywood2/spree,agient/agientstorefront,patdec/spree,firman/spree,ramkumar-kr/spree,Mayvenn/spree,fahidnasir/spree,knuepwebdev/FloatTubeRodHolders,watg/spree,volpejoaquin/spree,hoanghiep90/spree,jsurdilla/solidus,dotandbo/spree,shaywood2/spree,xuewenfei/solidus,tomash/spree,NerdsvilleCEO/spree,hoanghiep90/spree,progsri/spree,tailic/spree,grzlus/solidus,LBRapid/spree,CiscoCloud/spree,scottcrawford03/solidus,calvinl/spree,sunny2601/spree,hifly/spree,vinayvinsol/spree,dotandbo/spree,ckk-scratch/solidus,volpejoaquin/spree,FadliKun/spree,joanblake/spree,vinsol/spree,caiqinghua/spree,cutefrank/spree,jspizziri/spree,PhoenixTeam/spree_phoenix,patdec/spree,useiichi/spree,knuepwebdev/FloatTubeRodHolders,edgward/spree,jordan-brough/spree,camelmasa/spree,azclick/spree,Boomkat/spree,vcavallo/spree,APohio/spree,pervino/solidus,joanblake/spree,cutefrank/spree,bonobos/solidus,karlitxo/spree,shioyama/spree,adaddeo/spree,carlesjove/spree,welitonfreitas/spree,jasonfb/spree,sunny2601/spree,xuewenfei/solidus,lsirivong/solidus,miyazawatomoka/spree,gautamsawhney/spree,berkes/spree,yiqing95/spree,bonobos/solidus,trigrass2/spree,KMikhaylovCTG/spree,mleglise/spree,Machpowersystems/spree_mach,rakibulislam/spree,ahmetabdi/spree,lsirivong/spree,omarsar/spree,sideci-sample/sideci-sample-spree,builtbybuffalo/spree,carlesjove/spree,zamiang/spree,berkes/spree,pulkit21/spree,moneyspyder/spree,dafontaine/spree,raow/spree,jspizziri/spree