Revert "[ci skip] removed extra comma"
Revert "[ci skip] removed extra comma"

Reason: That one is an Oxford comma, as per our guidelines. See:

     http://edgeguides.rubyonrails.org/api_documentation_guidelines.html#comma

This reverts commit f184cd34f9ef35ddf85a23c2fb02cc05d3fb26b3.

tgxworld/rails,travisofthenorth/rails,flanger001/rails,ngpestelos/rails,koic/rails,Erol/rails,sealocal/rails,odedniv/rails,palkan/rails,samphilipd/rails,Erol/rails,kddeisz/rails,kenta-s/rails,Erol/rails,mathieujobin/reduced-rails-for-travis,kirs/rails-1,yahonda/rails,MichaelSp/rails,Stellenticket/rails,palkan/rails,felipecvo/rails,palkan/rails,fabianoleittes/rails,MSP-Greg/rails,lucasmazza/rails,Sen-Zhang/rails,ledestin/rails,koic/rails,pvalena/rails,kmcphillips/rails,bogdanvlviv/rails,mijoharas/rails,BlakeWilliams/rails,alecspopa/rails,kmcphillips/rails,bradleypriest/rails,riseshia/railsguides.kr,yalab/rails,schuetzm/rails,BlakeWilliams/rails,tjschuck/rails,mijoharas/rails,Edouard-chin/rails,baerjam/rails,starknx/rails,prathamesh-sonpatki/rails,rafaelfranca/omg-rails,jeremy/rails,iainbeeston/rails,yasslab/railsguides.jp,Stellenticket/rails,yhirano55/rails,voray/rails,illacceptanything/illacceptanything,mathieujobin/reduced-rails-for-travis,flanger001/rails,bogdanvlviv/rails,betesh/rails,arunagw/rails,arjes/rails,notapatch/rails,matrinox/rails,hanystudy/rails,eileencodes/rails,vipulnsward/rails,illacceptanything/illacceptanything,Vasfed/rails,travisofthenorth/rails,repinel/rails,joonyou/rails,printercu/rails,jeremy/rails,samphilipd/rails,iainbeeston/rails,kirs/rails-1,fabianoleittes/rails,schuetzm/rails,illacceptanything/illacceptanything,yawboakye/rails,kmayer/rails,printercu/rails,BlakeWilliams/rails,MichaelSp/rails,georgeclaghorn/rails,rbhitchcock/rails,amoody2108/TechForJustice,pschambacher/rails,Spin42/rails,georgeclaghorn/rails,arjes/rails,joonyou/rails,utilum/rails,pschambacher/rails,rossta/rails,baerjam/rails,ledestin/rails,repinel/rails,samphilipd/rails,illacceptanything/illacceptanything,xlymian/rails,maicher/rails,mechanicles/rails,rbhitchcock/rails,sealocal/rails,coreyward/rails,tgxworld/rails,shioyama/rails,yalab/rails,deraru/rails,illacceptanything/illacceptanything,felipecvo/rails,MSP-Greg/rails,kamipo/rails,illacceptanything/illacceptanything,vassilevsky/rails,jeremy/rails,arjes/rails,rails/rails,schuetzm/rails,gauravtiwari/rails,odedniv/rails,illacceptanything/illacceptanything,Vasfed/rails,richseviora/rails,mohitnatoo/rails,yasslab/railsguides.jp,rossta/rails,arunagw/rails,deraru/rails,esparta/rails,richseviora/rails,joonyou/rails,sergey-alekseev/rails,palkan/rails,Vasfed/rails,vipulnsward/rails,Stellenticket/rails,xlymian/rails,gcourtemanche/rails,baerjam/rails,odedniv/rails,gfvcastro/rails,rails/rails,rbhitchcock/rails,esparta/rails,maicher/rails,elfassy/rails,utilum/rails,georgeclaghorn/rails,flanger001/rails,gfvcastro/rails,BlakeWilliams/rails,kirs/rails-1,yawboakye/rails,fabianoleittes/rails,gcourtemanche/rails,aditya-kapoor/rails,Edouard-chin/rails,arunagw/rails,bradleypriest/rails,Sen-Zhang/rails,illacceptanything/illacceptanything,riseshia/railsguides.kr,mtsmfm/railstest,tgxworld/rails,amoody2108/TechForJustice,kddeisz/rails,Edouard-chin/rails,bogdanvlviv/rails,yasslab/railsguides.jp,yawboakye/rails,lcreid/rails,eileencodes/rails,matrinox/rails,illacceptanything/illacceptanything,mtsmfm/rails,alecspopa/rails,tijwelch/rails,stefanmb/rails,brchristian/rails,vipulnsward/rails,mijoharas/rails,lucasmazza/rails,mtsmfm/railstest,tijwelch/rails,hanystudy/rails,brchristian/rails,yhirano55/rails,stefanmb/rails,EmmaB/rails-1,iainbeeston/rails,assain/rails,deraru/rails,tjschuck/rails,elfassy/rails,betesh/rails,lucasmazza/rails,rafaelfranca/omg-rails,mechanicles/rails,Envek/rails,jeremy/rails,illacceptanything/illacceptanything,notapatch/rails,gavingmiller/rails,travisofthenorth/rails,yahonda/rails,repinel/rails,alecspopa/rails,esparta/rails,EmmaB/rails-1,ledestin/rails,Envek/rails,bolek/rails,mohitnatoo/rails,bolek/rails,kenta-s/rails,kmcphillips/rails,ttanimichi/rails,tjschuck/rails,kachick/rails,mtsmfm/rails,Envek/rails,prathamesh-sonpatki/rails,lcreid/rails,mechanicles/rails,mtsmfm/rails,marklocklear/rails,felipecvo/rails,eileencodes/rails,hanystudy/rails,MSP-Greg/rails,shioyama/rails,kachick/rails,marklocklear/rails,vipulnsward/rails,rafaelfranca/omg-rails,ttanimichi/rails,kmayer/rails,kamipo/rails,notapatch/rails,marklocklear/rails,esparta/rails,iainbeeston/rails,pschambacher/rails,yhirano55/rails,utilum/rails,sealocal/rails,untidy-hair/rails,starknx/rails,sergey-alekseev/rails,tjschuck/rails,gavingmiller/rails,baerjam/rails,mechanicles/rails,kamipo/rails,kachick/rails,eileencodes/rails,yawboakye/rails,travisofthenorth/rails,Erol/rails,untidy-hair/rails,riseshia/railsguides.kr,shioyama/rails,georgeclaghorn/rails,kddeisz/rails,assain/rails,assain/rails,coreyward/rails,betesh/rails,bolek/rails,fabianoleittes/rails,ttanimichi/rails,voray/rails,MSP-Greg/rails,flanger001/rails,illacceptanything/illacceptanything,yhirano55/rails,mtsmfm/railstest,vassilevsky/rails,amoody2108/TechForJustice,Edouard-chin/rails,aditya-kapoor/rails,tgxworld/rails,rails/rails,pvalena/rails,lcreid/rails,gcourtemanche/rails,arunagw/rails,aditya-kapoor/rails,sergey-alekseev/rails,vassilevsky/rails,illacceptanything/illa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