--HEAD checks
--HEAD checks

* Force --HEAD for head-only installs
* Don't allow --HEAD for stable-only formulae

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