brew.rb: uninstall old Homebrew Cask. (#121)
brew.rb: uninstall old Homebrew Cask. (#121)

This version is never wanted at this point and it will help Homebrew
Cask deal with the annoying errors that result from having this version
still around (some which I've already help users debug).
reitermarkus/brew,hanxue/linuxbrew,bfontaine/brew,muellermartin/dist,jmsundar/brew,vitorgalvao/brew,jmsundar/brew,bfontaine/brew,muellermartin/dist,vitorgalvao/brew,Linuxbrew/brew,staticfloat/brew,claui/brew,DomT4/brew,Homebrew/brew,palxex/brew,ilovezfs/brew,aw1621107/brew,gordonmcshane/homebrew,tonyg/homebrew,sjackman/homebrew,konqui/brew,mgrimes/brew,DomT4/brew,nandub/brew,amar-laksh/brew_sudo,JCount/brew,maxim-belkin/brew,rwhogg/brew,vitorgalvao/brew,Homebrew/brew,staticfloat/brew,nandub/brew,AnastasiaSulyagina/brew,mahori/brew,toonetown/homebrew,rwhogg/brew,nandub/brew,JCount/brew,Linuxbrew/brew,Homebrew/brew,alyssais/brew,DomT4/brew,aw1621107/brew,amar-laksh/brew_sudo,Linuxbrew/brew,vitorgalvao/brew,toonetown/homebrew,EricFromCanada/brew,sjackman/homebrew,ilovezfs/brew,MikeMcQuaid/brew,EricFromCanada/brew,claui/brew,MikeMcQuaid/brew,reelsense/brew,hanxue/linuxbrew,AnastasiaSulyagina/brew,zmwangx/brew,konqui/brew,gordonmcshane/homebrew,mgrimes/brew,tonyg/homebrew,gordonmcshane/homebrew,muellermartin/dist,MikeMcQuaid/brew,hanxue/linuxbrew,JCount/brew,reitermarkus/brew,zmwangx/brew,alyssais/brew,Homebrew/brew,gregory-nisbet/brew,tonyg/homebrew,mahori/brew,toonetown/homebrew,AnastasiaSulyagina/brew,bfontaine/brew,EricFromCanada/brew,mahori/brew,maxim-belkin/brew,gregory-nisbet/brew,rwhogg/brew,Linuxbrew/brew,JCount/brew,palxex/brew,pseudocody/brew,pseudocody/brew,mahori/brew,ilovezfs/brew,sjackman/homebrew,reitermarkus/brew,claui/brew,maxim-belkin/brew,gregory-nisbet/brew,staticfloat/brew,EricFromCanada/brew,konqui/brew,alyssais/brew,zmwangx/brew,sjackman/homebrew,DomT4/brew,palxex/brew,claui/brew,reelsense/brew,nandub/brew,MikeMcQuaid/brew,aw1621107/brew,amar-laksh/brew_sudo,konqui/brew,pseudocody/brew,reitermarkus/brew,jmsundar/brew,reelsense/brew,mgrimes/brew