formula_installer: use Sandbox.formula? method.
formula_installer: use Sandbox.formula? method.

EricFromCanada/brew,claui/brew,pseudocody/brew,Homebrew/brew,MikeMcQuaid/brew,palxex/brew,tonyg/homebrew,palxex/brew,AnastasiaSulyagina/brew,reelsense/brew,mgrimes/brew,hanxue/linuxbrew,vitorgalvao/brew,nandub/brew,amar-laksh/brew_sudo,jmsundar/brew,mahori/brew,DomT4/brew,Homebrew/brew,Linuxbrew/brew,bfontaine/brew,toonetown/homebrew,vitorgalvao/brew,rwhogg/brew,ilovezfs/brew,sjackman/homebrew,palxex/brew,konqui/brew,MikeMcQuaid/brew,reitermarkus/brew,hanxue/linuxbrew,vitorgalvao/brew,MikeMcQuaid/brew,aw1621107/brew,pseudocody/brew,mgrimes/brew,reitermarkus/brew,jmsundar/brew,ilovezfs/brew,sjackman/homebrew,mahori/brew,zmwangx/brew,bfontaine/brew,EricFromCanada/brew,maxim-belkin/brew,JCount/brew,Homebrew/brew,mahori/brew,maxim-belkin/brew,jmsundar/brew,JCount/brew,zmwangx/brew,hanxue/linuxbrew,DomT4/brew,gregory-nisbet/brew,tonyg/homebrew,maxim-belkin/brew,konqui/brew,AnastasiaSulyagina/brew,alyssais/brew,sjackman/homebrew,claui/brew,tonyg/homebrew,konqui/brew,JCount/brew,reelsense/brew,gregory-nisbet/brew,vitorgalvao/brew,claui/brew,sjackman/homebrew,claui/brew,Homebrew/brew,muellermartin/dist,mahori/brew,aw1621107/brew,nandub/brew,rwhogg/brew,EricFromCanada/brew,nandub/brew,muellermartin/dist,toonetown/homebrew,MikeMcQuaid/brew,Linuxbrew/brew,DomT4/brew,konqui/brew,reelsense/brew,reitermarkus/brew,AnastasiaSulyagina/brew,rwhogg/brew,EricFromCanada/brew,DomT4/brew,JCount/brew,zmwangx/brew,nandub/brew,gregory-nisbet/brew,Linuxbrew/brew,alyssais/brew,reitermarkus/brew,pseudocody/brew,ilovezfs/brew,amar-laksh/brew_sudo,alyssais/brew,mgrimes/brew,amar-laksh/brew_sudo,Linuxbrew/brew,muellermartin/dist,bfontaine/brew,toonetown/homebrew,aw1621107/brew