Refactor `FormulaLoader#get_formula`.
Refactor `FormulaLoader#get_formula`.

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