bottle: add merge_bottle_spec helper function
bottle: add merge_bottle_spec helper function

Homebrew/brew,vitorgalvao/brew,Homebrew/brew,EricFromCanada/brew,MikeMcQuaid/brew,EricFromCanada/brew,vitorgalvao/brew,nandub/brew,claui/brew,sjackman/homebrew,sjackman/homebrew,EricFromCanada/brew,sjackman/homebrew,Homebrew/brew,claui/brew,JCount/brew,MikeMcQuaid/brew,Homebrew/brew,EricFromCanada/brew,nandub/brew,claui/brew,JCount/brew,JCount/brew,vitorgalvao/brew,JCount/brew,nandub/brew,sjackman/homebrew,vitorgalvao/brew,MikeMcQuaid/brew,nandub/brew,MikeMcQuaid/brew,claui/brew