Clarify that preload_frameworks defaults to nil
Clarify that preload_frameworks defaults to nil

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