change plugins guide to favor gem based plugins, clean up to reflect the state of Rails3 plugins, remove information not compatible with Rails3.
change plugins guide to favor gem based plugins, clean up to reflect the state of Rails3 plugins, remove information not compatible with Rails3.

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