Fix RAILS_ROOT deprecation on guides generation. [#3710 status:resolved]
Fix RAILS_ROOT deprecation on guides generation. [#3710 status:resolved]

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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