Add "brew --cellar (formula)"
Add "brew --cellar (formula)"

If a formula name is passed to "brew --cellar", output the location of that
brew in the Cellar (which will be "brew --prefix (formula)" without a version
sub-folder.)

This allows for:
  rm -rf `brew --cellar node`
for deleting all versions of node, installed or not.

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