removed info about deprecated rake tasks, documented the sandbox option for the rails console and minor corrections
removed info about deprecated rake tasks, documented the sandbox option for the rails console and minor corrections

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,kirs/rails-1,travisofthenorth/rails,yahonda/rails,felipecvo/rails,illacceptanything/illacceptanything,sergey-alekseev/rails,yahonda/rails,yhirano55/rails,88rabbit/newRails,rossta/rails,eileencodes/rails,flanger001/rails,koic/rails,printercu/rails,eileencodes/rails,Vasfed/rails,mijoharas/rails,gavingmiller/rails,bolek/rails,bradleypriest/rails,vassilevsky/rails,mohitnatoo/rails,georgeclaghorn/rails,rails/rails,pvalena/rails,esparta/rails,georgeclaghorn/rails,88rabbit/newRails,fabianoleittes/rails,illacceptanything/illacceptanything,kenta-s/rails,travisofthenorth/rails,tgxworld/rails,prathamesh-sonpatki/rails,pschambacher/rails,rbhitchcock/rails,voray/rails,bradleypriest/rails,marklocklear/rails,felipecvo/rails,bolek/rails,brchristian/rails,Sen-Zhang/rails,Edouard-chin/rails,kirs/rails-1,kmcphillips/rails,stefanmb/rails,kamipo/rails,yalab/rails,felipecvo/rails,joonyou/rails,Envek/rails,vipulnsward/rails,riseshia/railsguides.kr,bogdanvlviv/rails,notapatch/rails,kmcphillips/rails,riseshia/railsguides.kr,kddeisz/rails,rafaelfranca/omg-rails,MSP-Greg/rails,gavingmiller/rails,bogdanvlviv/rails,Edouard-chin/rails,joonyou/rails,mathieujobin/reduced-rails-for-travis,prathamesh-sonpatki/rails,joonyou/rails,schuetzm/rails