Stronger wording in Contributing file
Stronger wording in Contributing file

Explicitly tell users to read the guide before submitting code. re: #7677. Specify the name of the mailing list for rubyonrails-talk to help differentiate it from rubyonrails-core mailing list. 

starknx/rails,gfvcastro/rails,bolek/rails,travisofthenorth/rails,iainbeeston/rails,kirs/rails-1,esparta/rails,palkan/rails,alecspopa/rails,kmcphillips/rails,mijoharas/rails,koic/rails,hanystudy/rails,arunagw/rails,odedniv/rails,aditya-kapoor/rails,repinel/rails,voray/rails,sergey-alekseev/rails,tgxworld/rails,gavingmiller/rails,bradleypriest/rails,odedniv/rails,rails/rails,kmcphillips/rails,schuetzm/rails,gauravtiwari/rails,yalab/rails,sergey-alekseev/rails,maicher/rails,kddeisz/rails,tgxworld/rails,samphilipd/rails,Erol/rails,notapatch/rails,mtsmfm/railstest,kddeisz/rails,illacceptanything/illacceptanything,vipulnsward/rails,tjschuck/rails,yasslab/railsguides.jp,bolek/rails,kaspth/rails,mtsmfm/rails,printercu/rails,shioyama/rails,notapatch/rails,MSP-Greg/rails,flanger001/rails,brchristian/rails,prathamesh-sonpatki/rails,untidy-hair/rails,Edouard-chin/rails,88rabbit/newRails,tijwelch/rails,ledestin/rails,yahonda/rails,georgeclaghorn/rails,repinel/rails,pvalena/rails,Edouard-chin/rails,coreyward/rails,tjschuck/rails,bradleypriest/rails,amoody2108/TechForJustice,rafaelfranca/omg-rails,betesh/rails,prathamesh-sonpatki/rails,assain/rails,Envek/rails,gcourtemanche/rails,Envek/rails,voray/rails,xlymian/rails,kenta-s/rails,schuetzm/rails,repinel/rails,vassilevsky/rails,yawboakye/rails,MichaelSp/rails,untidy-hair/rails,Vasfed/rails,EmmaB/rails-1,aditya-kapoor/rails,Envek/rails,kmayer/rails,yahonda/rails,mathieujobin/reduced-rails-for-travis,amoody2108/TechForJustice,iainbeeston/rails,esparta/rails,tgxworld/rails,kirs/rails-1,rbhitchcock/rails,utilum/rails,yawboakye/rails,mtsmfm/rails,deraru/rails,elfassy/rails,lcreid/rails,koic/rails,baerjam/rails,MSP-Greg/rails,gcourtemanche/rails,sergey-alekseev/rails,marklocklear/rails,Vasfed/rails,rails/rails,stefanmb/rails,betesh/rails,bradleypriest/rails,rossta/rails,illacceptanything/illacceptanything,yalab/rails,felipecvo/rails,assain/rails,printercu/rails,stefanmb/rails,bolek/rails,Erol/rails,shioyama/rails,BlakeWilliams/rails,rafaelfranca/omg-rails,arunagw/rails,gavingmiller/rails,yhirano55/rails,88rabbit/newRails,shioyama/rails,yhirano55/rails,Envek/rails,MichaelSp/rails,yawboakye/rails,arunagw/rails,kamipo/rails,gfvcastro/rails,Stellenticket/rails,kenta-s/rails,fabianoleittes/rails,richseviora/rails,hanystudy/rails,Erol/rails,georgeclaghorn/rails,odedniv/rails,gfvcastro/rails,arjes/rails,samphilipd/rails,kirs/rails-1,pvalena/rails,repinel/rails,MSP-Greg/rails,kmayer/rails,arjes/rails,baerjam/rails,printercu/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,pvalena/rails,notapatch/rails,lcreid/rails,ngpestelos/rails,kmcphillips/rails,xlymian/rails,illacceptanything/illacceptanything,vassilevsky/rails,richseviora/rails,matrinox/rails,yalab/rails,BlakeWilliams/rails,MichaelSp/rails,riseshia/railsguides.kr,schuetzm/rails,kmayer/rails,maicher/rails,felipecvo/rails,maicher/rails,brchristian/rails,fabianoleittes/rails,mtsmfm/railstest,tgxworld/rails,prathamesh-sonpatki/rails,esparta/rails,kachick/rails,mohitnatoo/rails,ttanimichi/rails,gauravtiwari/rails,ledestin/rails,elfassy/rails,coreyward/rails,matrinox/rails,lucasmazza/rails,illacceptanything/illacceptanything,baerjam/rails,mechanicles/rails,rbhitchcock/rails,tjschuck/rails,yalab/rails,samphilipd/rails,marklocklear/rails,xlymian/rails,bogdanvlviv/rails,felipecvo/rails,bogdanvlviv/rails,iainbeeston/rails,untidy-hair/rails,betesh/rails,assain/rails,aditya-kapoor/rails,Sen-Zhang/rails,arjes/rails,gavingmiller/rails,Sen-Zhang/rails,alecspopa/rails,Stellenticket/rails,tijwelch/rails,mathieujobin/reduced-rails-for-travis,joonyou/rails,yasslab/railsguides.jp,kmcphillips/rails,eileencodes/rails,tijwelch/rails,mijoharas/rails,betesh/rails,rails/rails,brchristian/rails,kachick/rails,rafaelfranca/omg-rails,prathamesh-sonpatki/rails,kaspth/rails,hanystudy/rails,vipulnsward/rails,BlakeWilliams/rails,Spin42/rails,sealocal/rails,eileencodes/rails,EmmaB/rails-1,rossta/rails,mohitnatoo/rails,richseviora/rails,utilum/rails,illacceptanything/illacceptanything,MSP-Greg/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,riseshia/railsguides.kr,yahonda/rails,mtsmfm/railstest,lcreid/rails,assain/rails,mtsmfm/rails,pschambacher/rails,gauravtiwari/rails,joonyou/rails,gcourtemanche/rails,palkan/rails,utilum/rails,vipulnsward/rails,schuetzm/rails,illacceptanything/illacceptanything,vipulnsward/rails,ttanimichi/rails,jeremy/rails,matrinox/rails,riseshia/railsguides.kr,bogdanvlviv/rails,iainbeeston/rails,rossta/rails,eileencodes/rails,Spin42/rails,flanger001/rails,yhirano55/rails,kachick/rails,yawboakye/rails,lucasmazza/rails,Sen-Zhang/rails,ngpestelos/rails,palkan/rails,travisofthenorth/rails,deraru/rails,palkan/rails,starknx/rails,kddeisz/rails,eileencodes/rails,elfassy/rails,aditya-kapoor/rails,lcreid/rails,joonyou/rails,ttanimichi/rails,vassilevsky/rails,flanger001/rails,esparta/rails,EmmaB/rails-1,yasslab/railsguides.jp,fabianoleittes/rails,illacceptanything/illacceptanything,ledestin/rails,tjschuck/rails,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