Add `vendored-gems` step.
Add `vendored-gems` step.

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