build scope chain functionally and remove caching
build scope chain functionally and remove caching

This commit walks the reflection tree and builds the scope chain
functionally.  It also removes the chain cache since the cache doesn't
seem to have any impact on performance (I'd prefer to only cache at
proven bottlenecks)

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